LeetCode-in-Kotlin

Kotlin Solution for LeetCode algorithm problems, continually updating.

Installation

Include the following in your pom.xml for Maven:

<dependencies>
  <dependency>
    <groupId>com.github.javadev</groupId>
    <artifactId>leetcode-in-kotlin</artifactId>
    <version>1.13</version>
  </dependency>
  ...
</dependencies>

Gradle:

implementation 'com.github.javadev:leetcode-in-kotlin:1.13'

"For coding interview preparation, LeetCode is one of the best online resource providing a rich library of more than 300 real coding interview questions for you to practice from using one of the 7 supported languages - C, C++, Java, Python, C#, JavaScript, Ruby."

Data Structure I
Data Structure II
Algorithm I
Algorithm II
Binary Search I
Binary Search II
Dynamic Programming I
Programming Skills I
Programming Skills II
Graph Theory I
SQL I
Level 1
Level 2
Udemy

Data Structure I

Day 1 Array


0217	Contains Duplicate	Easy	Top_Interview_Questions, Array, Hash_Table, Sorting	719	73.49
0053	Maximum Subarray	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer	662	82.48

Day 2 Array


0001	Two Sum	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table	234	92.75
0088	Merge Sorted Array	Easy	Top_Interview_Questions, Array, Sorting, Two_Pointers	311	33.40

Day 3 Array


0350	Intersection of Two Arrays II	Easy	Top_Interview_Questions, Array, Hash_Table, Sorting, Binary_Search, Two_Pointers	321	73.37
0121	Best Time to Buy and Sell Stock	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	609	94.06

Day 4 Array


0566	Reshape the Matrix	Easy	Array, Matrix, Simulation	239	99.05
0118	Pascal's Triangle	Easy	Top_Interview_Questions, Array, Dynamic_Programming	277	33.22

Day 5 Array


0036	Valid Sudoku	Medium	Top_Interview_Questions, Array, Hash_Table, Matrix	346	65.03
0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix	290	40.17

Day 6 String


0387	First Unique Character in a String	Easy	Top_Interview_Questions, String, Hash_Table, Counting, Queue	369	82.68
0383	Ransom Note	Easy	String, Hash_Table, Counting	333	79.58
0242	Valid Anagram	Easy	Top_Interview_Questions, String, Hash_Table, Sorting	251	87.65

Day 7 Linked List


0141	Linked List Cycle	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List	223	91.85
0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion	176	96.25
0203	Remove Linked List Elements	Easy	Linked_List, Recursion	233	91.22

Day 8 Linked List


0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion	279	45.78
0083	Remove Duplicates from Sorted List	Easy	Linked_List	274	77.82

Day 9 Stack Queue


0020	Valid Parentheses	Easy	Top_100_Liked_Questions, Top_Interview_Questions, String, Stack	226	72.53
0232	Implement Queue using Stacks	Easy	Stack, Design, Queue	258	70.86

Day 10 Tree


0144	Binary Tree Preorder Traversal	Easy	Depth_First_Search, Tree, Binary_Tree, Stack	277	37.90
0094	Binary Tree Inorder Traversal	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack	269	38.80
0145	Binary Tree Postorder Traversal	Easy	Depth_First_Search, Tree, Binary_Tree, Stack	211	80.00

Day 11 Tree


0102	Binary Tree Level Order Traversal	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree	332	67.53
0104	Maximum Depth of Binary Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	236	83.39
0101	Symmetric Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	190	91.36

Day 12 Tree


0226	Invert Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	233	54.90
0112	Path Sum	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	322	36.41

Day 13 Tree


0700	Search in a Binary Search Tree	Easy	Tree, Binary_Tree, Binary_Search_Tree	251	88.31
0701	Insert into a Binary Search Tree	Medium	Tree, Binary_Tree, Binary_Search_Tree	311	79.03

Day 14 Tree


0098	Validate Binary Search Tree	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	330	41.38
0653	Two Sum IV - Input is a BST	Easy	Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Two_Pointers, Binary_Search_Tree	231	96.08
0235	Lowest Common Ancestor of a Binary Search Tree	Easy	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	404	75.59

Data Structure II

Day 1 Array


0136	Single Number	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation	344	83.63
0169	Majority Element	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer	460	51.25
0015	3Sum	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers	761	90.55

Day 2 Array


0075	Sort Colors	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers	198	85.66
0056	Merge Intervals	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting	320	94.22
0706	Design HashMap	Easy	Array, Hash_Table, Design, Linked_List, Hash_Function	405	92.11

Day 3 Array


0119	Pascal's Triangle II	Easy	Array, Dynamic_Programming	157	97.27
0048	Rotate Image	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix	287	46.50
0059	Spiral Matrix II	Medium	Array, Matrix, Simulation	153	100.00

Day 4 Array


0240	Search a 2D Matrix II	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer	460	66.08
0435	Non-overlapping Intervals	Medium	Array, Dynamic_Programming, Sorting, Greedy	1040	85.07

Day 5 Array


0334	Increasing Triplet Subsequence	Medium	Top_Interview_Questions, Array, Greedy	672	60.61
0238	Product of Array Except Self	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Prefix_Sum	669	48.96
0560	Subarray Sum Equals K	Medium	Top_100_Liked_Questions, Array, Hash_Table, Prefix_Sum	692	53.27

Day 6 String


0415	Add Strings	Easy	String, Math, Simulation	296	76.00
0409	Longest Palindrome	Easy	String, Hash_Table, Greedy	259	60.71

Day 7 String


0290	Word Pattern	Easy	String, Hash_Table	177	89.55
0763	Partition Labels	Medium	Top_100_Liked_Questions, String, Hash_Table, Greedy, Two_Pointers	235	84.75

Day 8 String


0049	Group Anagrams	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting	506	86.55
0043	Multiply Strings	Medium	String, Math, Simulation	390	56.25

Day 9 String


0187	Repeated DNA Sequences	Medium	String, Hash_Table, Bit_Manipulation, Sliding_Window, Hash_Function, Rolling_Hash	319	79.03
0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming	323	75.48

Day 10 Linked List


0002	Add Two Numbers	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion	417	50.44
0142	Linked List Cycle II	Medium	Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List	192	63.39

Day 11 Linked List


0160	Intersection of Two Linked Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List	262	83.50
0082	Remove Duplicates from Sorted List II	Medium	Two_Pointers, Linked_List	241	91.04

Day 12 Linked List


0024	Swap Nodes in Pairs	Medium	Top_100_Liked_Questions, Linked_List, Recursion	149	99.39
0707	Design Linked List	Medium	Design, Linked_List	243	100.00

Day 13 Linked List


0025	Reverse Nodes in k-Group	Hard	Top_100_Liked_Questions, Linked_List, Recursion	194	87.72
0143	Reorder List	Medium	Two_Pointers, Stack, Linked_List, Recursion	395	82.26

Day 14 Stack Queue


0155	Min Stack	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design	331	84.88

Day 15 Tree


0108	Convert Sorted Array to Binary Search Tree	Easy	Top_Interview_Questions, Array, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer	334	35.39
0105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer	370	58.31
0103	Binary Tree Zigzag Level Order Traversal	Medium	Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree	316	34.25

Day 16 Tree


0199	Binary Tree Right Side View	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	194	92.89
0113	Path Sum II	Medium	Depth_First_Search, Tree, Binary_Tree, Backtracking	364	78.67
0450	Delete Node in a BST	Medium	Tree, Binary_Tree, Binary_Search_Tree	257	84.62

Day 17 Tree


0230	Kth Smallest Element in a BST	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	393	33.33
0173	Binary Search Tree Iterator	Medium	Tree, Binary_Tree, Stack, Design, Binary_Search_Tree, Iterator	563	46.91

Day 18 Tree


0236	Lowest Common Ancestor of a Binary Tree	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree	386	45.21
0297	Serialize and Deserialize Binary Tree	Hard	Top_Interview_Questions, String, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design	475	78.85

Day 19 Graph


0997	Find the Town Judge	Easy	Array, Hash_Table, Graph	475	58.62
0841	Keys and Rooms	Medium	Depth_First_Search, Breadth_First_Search, Graph	189	69.23

Day 20 Heap Priority Queue


0215	Kth Largest Element in an Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect	839	34.43
0347	Top K Frequent Elements	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Divide_and_Conquer, Quickselect, Bucket_Sort	268	99.74

Day 21 Heap Priority Queue


0451	Sort Characters By Frequency	Medium	String, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Bucket_Sort	288	81.72
0973	K Closest Points to Origin	Medium	Array, Math, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Geometry, Quickselect	800	37.89

Algorithm I

Day 1 Binary Search


0704	Binary Search	Easy	Array, Binary_Search	261	77.91
0278	First Bad Version	Easy	Binary_Search, Interactive	349	76.86
0035	Search Insert Position	Easy	Top_100_Liked_Questions, Array, Binary_Search	267	50.32

Day 2 Two Pointers


0977	Squares of a Sorted Array	Easy	Array, Sorting, Two_Pointers	375	18.43
0189	Rotate Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers	483	86.95

Day 3 Two Pointers


0283	Move Zeroes	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Two_Pointers	516	79.07
0167	Two Sum II - Input Array Is Sorted	Medium	Array, Binary_Search, Two_Pointers	403	68.74

Day 4 Two Pointers


0344	Reverse String	Easy	Top_Interview_Questions, String, Two_Pointers, Recursion	445	69.75
0557	Reverse Words in a String III	Easy	String, Two_Pointers	215	98.10

Day 5 Two Pointers


0876	Middle of the Linked List	Easy	Two_Pointers, Linked_List	136	76.52
0019	Remove Nth Node From End of List	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List	180	91.58

Day 6 Sliding Window


0003	Longest Substring Without Repeating Characters	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window	258	91.09
0567	Permutation in String	Medium	String, Hash_Table, Two_Pointers, Sliding_Window	169	100.00

Day 7 Breadth First Search Depth First Search


0733	Flood Fill	Easy	Array, Depth_First_Search, Breadth_First_Search, Matrix	230	97.76
0695	Max Area of Island	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	324	24.06

Day 8 Breadth First Search Depth First Search


0617	Merge Two Binary Trees	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	243	72.83
0116	Populating Next Right Pointers in Each Node	Medium	Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List	355	69.02

Day 9 Breadth First Search Depth First Search


0542	01 Matrix	Medium	Array, Dynamic_Programming, Breadth_First_Search, Matrix	441	94.06
0994	Rotting Oranges	Medium	Array, Breadth_First_Search, Matrix	164	82.95

Day 10 Recursion Backtracking


0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion	176	96.25
0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion	279	45.78

Day 11 Recursion Backtracking


0077	Combinations	Medium	Backtracking	244	100.00
0046	Permutations	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking	186	100.00
0784	Letter Case Permutation	Medium	String, Bit_Manipulation, Backtracking	219	84.62

Day 12 Dynamic Programming


0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization	127	97.06
0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	156	92.24
0120	Triangle	Medium	Array, Dynamic_Programming	194	97.87

Day 13 Bit Manipulation


0231	Power of Two	Easy	Math, Bit_Manipulation, Recursion	161	86.81
0191	Number of 1 Bits	Easy	Top_Interview_Questions, Bit_Manipulation	237	68.44

Day 14 Bit Manipulation


0190	Reverse Bits	Easy	Top_Interview_Questions, Bit_Manipulation, Divide_and_Conquer	198	81.82
0136	Single Number	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation	344	83.63

Algorithm II

Day 1 Binary Search


0034	Find First and Last Position of Element in Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search	228	83.38
0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search	184	86.08
0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix	290	40.17

Day 2 Binary Search


0153	Find Minimum in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Array, Binary_Search	262	60.96
0162	Find Peak Element	Medium	Top_Interview_Questions, Array, Binary_Search	297	53.85

Day 3 Two Pointers


0082	Remove Duplicates from Sorted List II	Medium	Two_Pointers, Linked_List	241	91.04
0015	3Sum	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers	761	90.55

Day 4 Two Pointers


0844	Backspace String Compare	Easy	String, Two_Pointers, Stack, Simulation	126	98.31
0986	Interval List Intersections	Medium	Array, Two_Pointers	318	60.98
0011	Container With Most Water	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers	474	89.18

Day 5 Sliding Window


0438	Find All Anagrams in a String	Medium	Top_100_Liked_Questions, String, Hash_Table, Sliding_Window	561	54.68
0713	Subarray Product Less Than K	Medium	Array, Sliding_Window	336	92.11
0209	Minimum Size Subarray Sum	Medium	Array, Binary_Search, Prefix_Sum, Sliding_Window	315	96.73

Day 6 Breadth First Search Depth First Search


0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	252	95.41
0547	Number of Provinces	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	229	79.73

Day 7 Breadth First Search Depth First Search


0117	Populating Next Right Pointers in Each Node II	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List	199	94.67
0572	Subtree of Another Tree	Easy	Depth_First_Search, Tree, Binary_Tree, Hash_Function, String_Matching	214	92.39

Day 8 Breadth First Search Depth First Search


0130	Surrounded Regions	Medium	Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	355	84.42
0797	All Paths From Source to Target	Medium	Depth_First_Search, Breadth_First_Search, Graph, Backtracking	232	100.00

Day 9 Recursion Backtracking


0078	Subsets	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking	191	97.44
0090	Subsets II	Medium	Array, Bit_Manipulation, Backtracking	366	58.09

Day 10 Recursion Backtracking


0047	Permutations II	Medium	Array, Backtracking	406	76.36
0039	Combination Sum	Medium	Top_100_Liked_Questions, Array, Backtracking	317	86.85
0040	Combination Sum II	Medium	Array, Backtracking	348	80.92

Day 11 Recursion Backtracking


0017	Letter Combinations of a Phone Number	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking	262	73.59
0022	Generate Parentheses	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking	210	78.51
0079	Word Search	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking	463	68.49

Day 12 Dynamic Programming


0213	House Robber II	Medium	Array, Dynamic_Programming	257	59.62
0055	Jump Game	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy	670	66.67

Day 13 Dynamic Programming


0045	Jump Game II	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy	227	98.14
0062	Unique Paths	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics	209	49.18

Day 14 Dynamic Programming


0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming	323	75.48
0413	Arithmetic Slices	Medium	Array, Dynamic_Programming	156	100.00

Day 15 Dynamic Programming


0091	Decode Ways	Medium	Top_Interview_Questions, String, Dynamic_Programming	237	76.88
0139	Word Break	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization	197	87.17

Day 16 Dynamic Programming


0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search	318	82.28
0673	Number of Longest Increasing Subsequence	Medium	Array, Dynamic_Programming, Segment_Tree, Binary_Indexed_Tree	226	91.67

Day 17 Dynamic Programming


1143	Longest Common Subsequence	Medium	Top_100_Liked_Questions, String, Dynamic_Programming	307	38.36
0583	Delete Operation for Two Strings	Medium	String, Dynamic_Programming	197	100.00

Day 18 Dynamic Programming


0072	Edit Distance	Hard	Top_100_Liked_Questions, String, Dynamic_Programming	320	63.53
0322	Coin Change	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search	332	50.68
0343	Integer Break	Medium	Dynamic_Programming, Math	218	63.89

Day 19 Bit Manipulation


0201	Bitwise AND of Numbers Range	Medium	Bit_Manipulation	368	80.00

Day 20 Others


0384	Shuffle an Array	Medium	Top_Interview_Questions, Array, Math, Randomized	940	72.09

Day 21 Others


0202	Happy Number	Easy	Top_Interview_Questions, Hash_Table, Math, Two_Pointers	261	45.08
0149	Max Points on a Line	Hard	Top_Interview_Questions, Array, Hash_Table, Math, Geometry	307	83.33

Binary Search I

Day 1


0704	Binary Search	Easy	Array, Binary_Search	261	77.91
0374	Guess Number Higher or Lower	Easy	Binary_Search, Interactive	134	94.19

Day 2


0035	Search Insert Position	Easy	Top_100_Liked_Questions, Array, Binary_Search	267	50.32
0852	Peak Index in a Mountain Array	Easy	Array, Binary_Search	433	94.29

Day 3


0367	Valid Perfect Square	Easy	Math, Binary_Search	137	94.55

Day 4


0069	Sqrt(x)	Easy	Top_Interview_Questions, Math, Binary_Search	153	95.75
0744	Find Smallest Letter Greater Than Target	Easy	Array, Binary_Search	162	100.00

Day 5


0278	First Bad Version	Easy	Binary_Search, Interactive	349	76.86
0034	Find First and Last Position of Element in Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search	228	83.38

Day 6


0441	Arranging Coins	Easy	Math, Binary_Search	150	84.21

Day 7


0167	Two Sum II - Input Array Is Sorted	Medium	Array, Binary_Search, Two_Pointers	403	68.74

Day 8


0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix	290	40.17

Day 9

Day 10


0350	Intersection of Two Arrays II	Easy	Top_Interview_Questions, Array, Hash_Table, Sorting, Binary_Search, Two_Pointers	321	73.37
0633	Sum of Square Numbers	Medium	Math, Binary_Search, Two_Pointers	126	100.00

Day 11


0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search	184	86.08

Day 12


0153	Find Minimum in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Array, Binary_Search	262	60.96

Binary Search II

Day 1


0209	Minimum Size Subarray Sum	Medium	Array, Binary_Search, Prefix_Sum, Sliding_Window	315	96.73
0611	Valid Triangle Number	Medium	Array, Sorting, Greedy, Binary_Search, Two_Pointers	203	100.00

Day 2


0658	Find K Closest Elements	Medium	Array, Sorting, Binary_Search, Two_Pointers, Heap_Priority_Queue	375	95.16

Day 3


0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search	318	82.28

Day 4


0875	Koko Eating Bananas	Medium	Array, Binary_Search	267	93.85

Day 5


0287	Find the Duplicate Number	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Two_Pointers, Bit_Manipulation	656	66.21

Day 6

Day 7

Day 8


0240	Search a 2D Matrix II	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer	460	66.08
0275	H-Index II	Medium	Array, Binary_Search	398	81.82

Day 9


0540	Single Element in a Sorted Array	Medium	Array, Binary_Search	274	86.67

Day 10


0222	Count Complete Tree Nodes

Day 11


0826	Most Profit Assigning Work	Medium	Array, Sorting, Greedy, Binary_Search, Two_Pointers	366	100.00
0436	Find Right Interval	Medium	Array, Sorting, Binary_Search	333	100.00

Day 12


0081	Search in Rotated Sorted Array II	Medium	Array, Binary_Search	352	42.31
0162	Find Peak Element	Medium	Top_Interview_Questions, Array, Binary_Search	297	53.85

Day 13


0154	Find Minimum in Rotated Sorted Array II	Hard	Array, Binary_Search	275	84.00
0528	Random Pick with Weight	Medium	Math, Binary_Search, Prefix_Sum, Randomized	393	91.38

Day 14

Day 15

Day 16


0981	Time Based Key-Value Store	Medium	String, Hash_Table, Binary_Search, Design	1555	10.00

Day 17

Day 18


1146	Snapshot Array	Medium	Array, Hash_Table, Binary_Search, Design	1064	57.14

Day 19

Day 20


0911	Online Election	Medium	Array, Hash_Table, Binary_Search, Design	766	83.33

Dynamic Programming I

Day 1


0509	Fibonacci Number	Easy	Dynamic_Programming, Math, Recursion, Memoization	139	82.72
1137	N-th Tribonacci Number	Easy	Dynamic_Programming, Math, Memoization	122	69.35

Day 2


0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization	127	97.06
0746	Min Cost Climbing Stairs	Easy	Array, Dynamic_Programming	171	96.76

Day 3


0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	156	92.24
0213	House Robber II	Medium	Array, Dynamic_Programming	257	59.62
0740	Delete and Earn	Medium	Array, Hash_Table, Dynamic_Programming	192	100.00

Day 4


0055	Jump Game	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy	670	66.67
0045	Jump Game II	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy	227	98.14

Day 5


0053	Maximum Subarray	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer	662	82.48
0918	Maximum Sum Circular Subarray	Medium	Array, Dynamic_Programming, Divide_and_Conquer, Queue, Monotonic_Queue	339	86.96

Day 6


0152	Maximum Product Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	253	88.42

Day 7


1014	Best Sightseeing Pair	Medium	Array, Dynamic_Programming	336	66.67
0121	Best Time to Buy and Sell Stock	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	609	94.06
0122	Best Time to Buy and Sell Stock II	Medium	Top_Interview_Questions, Array, Dynamic_Programming, Greedy	197	95.10

Day 8


0309	Best Time to Buy and Sell Stock with Cooldown	Medium	Array, Dynamic_Programming	272	73.33
0714	Best Time to Buy and Sell Stock with Transaction Fee	Medium	Array, Dynamic_Programming, Greedy	417	90.91

Day 9


0139	Word Break	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization	197	87.17
0042	Trapping Rain Water	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack	196	100.00

Day 10


0413	Arithmetic Slices	Medium	Array, Dynamic_Programming	156	100.00
0091	Decode Ways	Medium	Top_Interview_Questions, String, Dynamic_Programming	237	76.88

Day 11


0264	Ugly Number II	Medium	Hash_Table, Dynamic_Programming, Math, Heap_Priority_Queue	182	95.45
0096	Unique Binary Search Trees	Medium	Top_100_Liked_Questions, Dynamic_Programming, Math, Tree, Binary_Tree, Binary_Search_Tree	147	88.52

Day 12


0118	Pascal's Triangle	Easy	Top_Interview_Questions, Array, Dynamic_Programming	277	33.22
0119	Pascal's Triangle II	Easy	Array, Dynamic_Programming	157	97.27

Day 13


0931	Minimum Falling Path Sum	Medium	Array, Dynamic_Programming, Matrix	201	84.21
0120	Triangle	Medium	Array, Dynamic_Programming	194	97.87

Day 14


0304	Range Sum Query 2D - Immutable	Medium	Array, Matrix, Design, Prefix_Sum	1373	85.71

Day 15


0062	Unique Paths	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics	209	49.18
0063	Unique Paths II	Medium	Array, Dynamic_Programming, Matrix	187	84.62

Day 16


0064	Minimum Path Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix	222	95.70
0221	Maximal Square	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix	614	44.00

Day 17


0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming	323	75.48
0516	Longest Palindromic Subsequence	Medium	String, Dynamic_Programming	243	87.50

Day 18


0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search	318	82.28
0376	Wiggle Subsequence	Medium	Array, Dynamic_Programming, Greedy	162	88.89

Day 19


0392	Is Subsequence	Easy	String, Dynamic_Programming, Two_Pointers	156	87.74
1143	Longest Common Subsequence	Medium	Top_100_Liked_Questions, String, Dynamic_Programming	307	38.36
0072	Edit Distance	Hard	Top_100_Liked_Questions, String, Dynamic_Programming	320	63.53

Day 20


0322	Coin Change	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search	332	50.68
0518	Coin Change II	Medium	Array, Dynamic_Programming	139	100.00

Day 21


0377	Combination Sum IV	Medium	Array, Dynamic_Programming	217	72.41
0343	Integer Break	Medium	Dynamic_Programming, Math	218	63.89
0279	Perfect Squares	Medium	Top_Interview_Questions, Dynamic_Programming, Math, Breadth_First_Search	176	98.80

Programming Skills I

Day 1 Basic Data Type

Day 2 Operator


0191	Number of 1 Bits	Easy	Top_Interview_Questions, Bit_Manipulation	237	68.44

Day 3 Conditional Statements


0976	Largest Perimeter Triangle	Easy	Array, Math, Sorting, Greedy	304	33.33

Day 4 Loop


0202	Happy Number	Easy	Top_Interview_Questions, Hash_Table, Math, Two_Pointers	261	45.08

Day 5 Function


0589	N-ary Tree Preorder Traversal	Easy	Depth_First_Search, Tree, Stack	233	84.02
0496	Next Greater Element I	Easy	Array, Hash_Table, Stack, Monotonic_Stack	171	100.00

Day 6 Array


0283	Move Zeroes	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Two_Pointers	516	79.07

Day 7 Array


0566	Reshape the Matrix	Easy	Array, Matrix, Simulation	239	99.05

Day 8 String


0389	Find the Difference	Easy	String, Hash_Table, Sorting, Bit_Manipulation	256	64.81

Day 9 String


0709	To Lower Case	Easy	String	142	98.68
0953	Verifying an Alien Dictionary	Easy	Array, String, Hash_Table	137	100.00

Day 10 Linked List and Tree


0876	Middle of the Linked List	Easy	Two_Pointers, Linked_List	136	76.52
0104	Maximum Depth of Binary Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	236	83.39
0404	Sum of Left Leaves	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	173	86.05

Day 11 Containers and Libraries


0232	Implement Queue using Stacks	Easy	Stack, Design, Queue	258	70.86
0242	Valid Anagram	Easy	Top_Interview_Questions, String, Hash_Table, Sorting	251	87.65
0217	Contains Duplicate	Easy	Top_Interview_Questions, Array, Hash_Table, Sorting	719	73.49

Day 12 Class and Object


0303	Range Sum Query - Immutable	Easy	Array, Design, Prefix_Sum	472	63.64

Programming Skills II

Day 1


0896	Monotonic Array	Easy	Array	576	90.91
0028	Find the Index of the First Occurrence in a String	Easy	Top_Interview_Questions, String, Two_Pointers, String_Matching	257	32.35

Day 2


0110	Balanced Binary Tree	Easy	Depth_First_Search, Tree, Binary_Tree	310	63.63
0459	Repeated Substring Pattern	Easy	String, String_Matching	201	100.00

Day 3


0150	Evaluate Reverse Polish Notation	Medium	Top_Interview_Questions, Array, Math, Stack	233	88.82
0066	Plus One	Easy	Top_Interview_Questions, Array, Math	303	35.18

Day 4


0043	Multiply Strings	Medium	String, Math, Simulation	390	56.25

Day 5


0067	Add Binary	Easy	String, Math, Bit_Manipulation, Simulation	327	32.67
0989	Add to Array-Form of Integer	Easy	Array, Math	350	70.00

Day 6


0739	Daily Temperatures	Medium	Top_100_Liked_Questions, Array, Stack, Monotonic_Stack	936	80.54
0058	Length of Last Word	Easy	String	243	63.33

Day 7


0048	Rotate Image	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix	287	46.50

Day 8


0054	Spiral Matrix	Medium	Top_Interview_Questions, Array, Matrix, Simulation	224	62.50
0973	K Closest Points to Origin	Medium	Array, Math, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Geometry, Quickselect	800	37.89

Day 9


0429	N-ary Tree Level Order Traversal	Medium	Breadth_First_Search, Tree	248	75.86

Day 10


0503	Next Greater Element II	Medium	Array, Stack, Monotonic_Stack	331	92.68
0556	Next Greater Element III	Medium	String, Math, Two_Pointers	137	80.00

Day 11


0049	Group Anagrams	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting	506	86.55

Day 12


0438	Find All Anagrams in a String	Medium	Top_100_Liked_Questions, String, Hash_Table, Sliding_Window	561	54.68
0713	Subarray Product Less Than K	Medium	Array, Sliding_Window	336	92.11

Day 13


0304	Range Sum Query 2D - Immutable	Medium	Array, Matrix, Design, Prefix_Sum	1373	85.71
0910	Smallest Range II	Medium	Array, Math, Sorting, Greedy	234	100.00

Day 14


0143	Reorder List	Medium	Two_Pointers, Stack, Linked_List, Recursion	395	82.26
0138	Copy List with Random Pointer	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List	274	80.58

Day 15


0002	Add Two Numbers	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion	417	50.44
0445	Add Two Numbers II	Medium	Math, Stack, Linked_List	240	82.61

Day 16


0061	Rotate List	Medium	Two_Pointers, Linked_List	193	92.16
0173	Binary Search Tree Iterator	Medium	Tree, Binary_Tree, Stack, Design, Binary_Search_Tree, Iterator	563	46.91

Day 17


0860	Lemonade Change	Easy	Array, Greedy	413	86.96

Day 18


0155	Min Stack	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design	331	84.88
0341	Flatten Nested List Iterator	Medium	Top_Interview_Questions, Depth_First_Search, Tree, Stack, Design, Queue, Iterator	210	100.00

Day 19


0707	Design Linked List	Medium	Design, Linked_List	243	100.00

Day 20


0380	Insert Delete GetRandom O(1)	Medium	Top_Interview_Questions, Array, Hash_Table, Math, Design, Randomized	1326	68.23
0622	Design Circular Queue	Medium	Array, Design, Linked_List, Queue	234	92.68
0729	My Calendar I	Medium	Binary_Search, Design, Ordered_Set, Segment_Tree	378	69.70

Graph Theory I

Day 1 Matrix Related Problems


0733	Flood Fill	Easy	Array, Depth_First_Search, Breadth_First_Search, Matrix	230	97.76
0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	252	95.41

Day 2 Matrix Related Problems


0695	Max Area of Island	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	324	24.06

Day 3 Matrix Related Problems


1020	Number of Enclaves	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	369	76.26

Day 4 Matrix Related Problems


1162	As Far from Land as Possible	Medium	Array, Dynamic_Programming, Breadth_First_Search, Matrix	362	81.25
0417	Pacific Atlantic Water Flow	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix	319	100.00

Day 5 Matrix Related Problems


0542	01 Matrix	Medium	Array, Dynamic_Programming, Breadth_First_Search, Matrix	441	94.06

Day 6 Matrix Related Problems


0934	Shortest Bridge	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix	301	80.95

Day 7 Standard Traversal


0797	All Paths From Source to Target	Medium	Depth_First_Search, Breadth_First_Search, Graph, Backtracking	232	100.00
0841	Keys and Rooms	Medium	Depth_First_Search, Breadth_First_Search, Graph	189	69.23

Day 8 Standard Traversal


0547	Number of Provinces	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	229	79.73

Day 9 Standard Traversal


0802	Find Eventual Safe States	Medium	Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort	511	100.00

Day 10 Standard Traversal


1129	Shortest Path with Alternating Colors	Medium	Breadth_First_Search, Graph	241	16.67
0847	Shortest Path Visiting All Nodes	Hard	Dynamic_Programming, Breadth_First_Search, Bit_Manipulation, Graph, Bitmask	164	100.00

Day 11 Breadth First Search


0365	Water and Jug Problem	Medium	Math, Depth_First_Search, Breadth_First_Search	130	100.00

Day 12 Breadth First Search


0433	Minimum Genetic Mutation	Medium	String, Hash_Table, Breadth_First_Search	204	82.08
0752	Open the Lock	Medium	Array, String, Hash_Table, Breadth_First_Search	310	100.00
0127	Word Ladder	Hard	Top_Interview_Questions, String, Hash_Table, Breadth_First_Search	396	98.68

Day 13 Graph Theory


0997	Find the Town Judge	Easy	Array, Hash_Table, Graph	475	58.62

Day 14 Graph Theory


0886	Possible Bipartition	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	397	100.00
0785	Is Graph Bipartite?	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	215	82.35

SQL I

Day 1 Select


0595	Big Countries	Easy	Database	417	56.09
0584	Find Customer Referee	Easy	Database	779	43.48
0183	Customers Who Never Order	Easy	Database	712	33.67

Day 2 Select and Order


0627	Swap Salary	Easy	Database	400	51.04
0196	Delete Duplicate Emails	Easy	Database	593	94.17

Day 3 String Processing Functions

Day 4 Union and Select


0608	Tree Node	Medium	LeetCode_Curated_SQL_70, Database	794	48.38
0176	Second Highest Salary	Medium	Database	219	92.54

Day 5 Union


0175	Combine Two Tables	Easy	Database	473	54.97
1148	Article Views I	Easy	LeetCode_Curated_SQL_70, Database	806	54.41

Day 6 Union


0197	Rising Temperature	Easy	Database	394	94.15
0607	Sales Person	Easy	LeetCode_Curated_SQL_70, Database	2142	44.56

Day 7 Function


1141	User Activity for the Past 30 Days I	Easy	LeetCode_Curated_SQL_70, Database	790	87.11

Day 8 Function


0586	Customer Placing the Largest Number of Orders	Easy	LeetCode_Curated_SQL_70, Database	768	44.85
0511	Game Play Analysis I	Easy	LeetCode_Curated_SQL_70, Database	790	45.04

Day 9 Control of Flow


1158	Market Analysis I	Medium	Database	2470	44.76

Day 10 Where


0182	Duplicate Emails	Easy	Database	396	68.40
1050	Actors and Directors Who Cooperated At Least Three Times	Easy	LeetCode_Curated_SQL_70, Database	629	81.02

Level 1

Day 1 Prefix Sum


0724	Find Pivot Index	Easy	Array, Prefix_Sum	255	88.92

Day 2 String


0205	Isomorphic Strings	Easy	String, Hash_Table	278	79.96
0392	Is Subsequence	Easy	String, Dynamic_Programming, Two_Pointers	156	87.74

Day 3 Linked List


0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion	176	96.25
0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion	279	45.78

Day 4 Linked List


0876	Middle of the Linked List	Easy	Two_Pointers, Linked_List	136	76.52
0142	Linked List Cycle II	Medium	Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List	192	63.39

Day 5 Greedy


0121	Best Time to Buy and Sell Stock	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	609	94.06
0409	Longest Palindrome	Easy	String, Hash_Table, Greedy	259	60.71

Day 6 Tree


0589	N-ary Tree Preorder Traversal	Easy	Depth_First_Search, Tree, Stack	233	84.02
0102	Binary Tree Level Order Traversal	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree	332	67.53

Day 7 Binary Search


0704	Binary Search	Easy	Array, Binary_Search	261	77.91
0278	First Bad Version	Easy	Binary_Search, Interactive	349	76.86

Day 8 Binary Search Tree


0098	Validate Binary Search Tree	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	330	41.38
0235	Lowest Common Ancestor of a Binary Search Tree	Easy	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	404	75.59

Day 9 Graph/BFS/DFS


0733	Flood Fill	Easy	Array, Depth_First_Search, Breadth_First_Search, Matrix	230	97.76
0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	252	95.41

Day 10 Dynamic Programming


0509	Fibonacci Number	Easy	Dynamic_Programming, Math, Recursion, Memoization	139	82.72
0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization	127	97.06

Day 11 Dynamic Programming


0746	Min Cost Climbing Stairs	Easy	Array, Dynamic_Programming	171	96.76
0062	Unique Paths	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics	209	49.18

Day 12 Sliding Window/Two Pointer


0438	Find All Anagrams in a String	Medium	Top_100_Liked_Questions, String, Hash_Table, Sliding_Window	561	54.68
0424	Longest Repeating Character Replacement	Medium	String, Hash_Table, Sliding_Window	288	84.38

Day 13 Hashmap


0001	Two Sum	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table	234	92.75
0299	Bulls and Cows	Medium	String, Hash_Table, Counting	254	84.82

Day 14 Stack


0844	Backspace String Compare	Easy	String, Two_Pointers, Stack, Simulation	126	98.31
0394	Decode String	Medium	Top_100_Liked_Questions, String, Stack, Recursion	224	64.86

Day 15 Heap


1046	Last Stone Weight	Easy	Array, Heap_Priority_Queue	123	100.00
0692	Top K Frequent Words	Medium	String, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Trie, Bucket_Sort	239	81.10

Level 2

Day 1 Implementation/Simulation


0202	Happy Number	Easy	Top_Interview_Questions, Hash_Table, Math, Two_Pointers	261	45.08
0054	Spiral Matrix	Medium	Top_Interview_Questions, Array, Matrix, Simulation	224	62.50

Day 2 String


0014	Longest Common Prefix	Easy	Top_Interview_Questions, String	209	88.86
0043	Multiply Strings	Medium	String, Math, Simulation	390	56.25

Day 3 Linked List


0019	Remove Nth Node From End of List	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List	180	91.58
0234	Palindrome Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Stack, Linked_List, Recursion	641	79.53

Day 4 Linked List


0328	Odd Even Linked List	Medium	Top_Interview_Questions, Linked_List	216	86.96
0148	Sort List	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Linked_List, Divide_and_Conquer, Merge_Sort	820	61.70

Day 5 Greedy


0621	Task Scheduler	Medium	Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting	266	98.36

Day 6 Tree


0226	Invert Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	233	54.90
0110	Balanced Binary Tree	Easy	Depth_First_Search, Tree, Binary_Tree	310	63.63

Day 7 Tree


0543	Diameter of Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree	307	43.93
0437	Path Sum III	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree	403	54.12

Day 8 Binary Search


0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix	290	40.17
0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search	184	86.08

Day 9 Binary Search Tree


0108	Convert Sorted Array to Binary Search Tree	Easy	Top_Interview_Questions, Array, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer	334	35.39
0230	Kth Smallest Element in a BST	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	393	33.33
0173	Binary Search Tree Iterator	Medium	Tree, Binary_Tree, Stack, Design, Binary_Search_Tree, Iterator	563	46.91

Day 10 Graph/BFS/DFS


0994	Rotting Oranges	Medium	Array, Breadth_First_Search, Matrix	164	82.95
0417	Pacific Atlantic Water Flow	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix	319	100.00

Day 11 Graph/BFS/DFS


0210	Course Schedule II	Medium	Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort	266	96.32
0815	Bus Routes	Hard	Array, Hash_Table, Breadth_First_Search	429	100.00

Day 12 Dynamic Programming


0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	156	92.24
0322	Coin Change	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search	332	50.68

Day 13 Dynamic Programming


0416	Partition Equal Subset Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming	204	98.82
0152	Maximum Product Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	253	88.42

Day 14 Sliding Window/Two Pointer


0003	Longest Substring Without Repeating Characters	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window	258	91.09
0016	3Sum Closest	Medium	Array, Sorting, Two_Pointers	413	95.05
0076	Minimum Window Substring	Hard	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window	346	85.20

Day 15 Tree


0100	Same Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	208	72.24
0101	Symmetric Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	190	91.36
0199	Binary Tree Right Side View	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	194	92.89

Day 16 Design


0232	Implement Queue using Stacks	Easy	Stack, Design, Queue	258	70.86
0155	Min Stack	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design	331	84.88
0208	Implement Trie (Prefix Tree)	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie	689	61.00

Day 17 Interval


0057	Insert Interval	Medium	Array	257	99.52
0056	Merge Intervals	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting	320	94.22

Day 18 Stack


0735	Asteroid Collision	Medium	Array, Stack	243	100.00
0227	Basic Calculator II	Medium	Top_Interview_Questions, String, Math, Stack	383	62.50

Day 19 Union Find


0547	Number of Provinces	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	229	79.73
0947	Most Stones Removed with Same Row or Column	Medium	Depth_First_Search, Graph, Union_Find	200	100.00

Day 20 Brute Force/Backtracking


0039	Combination Sum	Medium	Top_100_Liked_Questions, Array, Backtracking	317	86.85
0046	Permutations	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking	186	100.00

Udemy

Udemy Integers


0412	Fizz Buzz	Easy	Top_Interview_Questions, String, Math, Simulation	307	71.81
0136	Single Number	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation	344	83.63
0007	Reverse Integer	Medium	Top_Interview_Questions, Math	245	60.32
0009	Palindrome Number	Easy	Math	238	96.24
0172	Factorial Trailing Zeroes	Medium	Top_Interview_Questions, Math	220	67.65
0050	Pow(x, n)	Medium	Top_Interview_Questions, Math, Recursion	264	52.98

Udemy Strings


0344	Reverse String	Easy	Top_Interview_Questions, String, Two_Pointers, Recursion	445	69.75
0014	Longest Common Prefix	Easy	Top_Interview_Questions, String	209	88.86
0187	Repeated DNA Sequences	Medium	String, Hash_Table, Bit_Manipulation, Sliding_Window, Hash_Function, Rolling_Hash	319	79.03
0003	Longest Substring Without Repeating Characters	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window	258	91.09
0020	Valid Parentheses	Easy	Top_100_Liked_Questions, Top_Interview_Questions, String, Stack	226	72.53
0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming	323	75.48
0394	Decode String	Medium	Top_100_Liked_Questions, String, Stack, Recursion	224	64.86
0242	Valid Anagram	Easy	Top_Interview_Questions, String, Hash_Table, Sorting	251	87.65
0049	Group Anagrams	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting	506	86.55
0151	Reverse Words in a String	Medium	String, Two_Pointers	206	98.90
0273	Integer to English Words	Hard	String, Math, Recursion	273	82.93

Udemy Binary Search


0704	Binary Search	Easy	Array, Binary_Search	261	77.91
0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search	184	86.08
0153	Find Minimum in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Array, Binary_Search	262	60.96

Udemy Arrays


0121	Best Time to Buy and Sell Stock	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	609	94.06
0283	Move Zeroes	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Two_Pointers	516	79.07
0001	Two Sum	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table	234	92.75
0217	Contains Duplicate	Easy	Top_Interview_Questions, Array, Hash_Table, Sorting	719	73.49
0058	Length of Last Word	Easy	String	243	63.33
0605	Can Place Flowers	Easy	Array, Greedy	209	85.71
0122	Best Time to Buy and Sell Stock II	Medium	Top_Interview_Questions, Array, Dynamic_Programming, Greedy	197	95.10
0080	Remove Duplicates from Sorted Array II	Medium	Array, Two_Pointers	357	44.78
0189	Rotate Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers	483	86.95
0055	Jump Game	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy	670	66.67
0075	Sort Colors	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers	198	85.66
0066	Plus One	Easy	Top_Interview_Questions, Array, Math	303	35.18
0238	Product of Array Except Self	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Prefix_Sum	669	48.96
0448	Find All Numbers Disappeared in an Array	Easy	Array, Hash_Table	394	100.00
0442	Find All Duplicates in an Array	Medium	Array, Hash_Table	480	73.81
0041	First Missing Positive	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table	345	100.00
0697	Degree of an Array	Easy	Array, Hash_Table	289	84.62
0532	K-diff Pairs in an Array	Medium	Array, Hash_Table, Sorting, Binary_Search, Two_Pointers	230	84.62
0713	Subarray Product Less Than K	Medium	Array, Sliding_Window	336	92.11
1007	Minimum Domino Rotations For Equal Row	Medium	Array, Greedy	421	50.00
0456	132 Pattern	Medium	Array, Binary_Search, Stack, Ordered_Set, Monotonic_Stack	434	100.00
0239	Sliding Window Maximum	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue	1059	86.14

Udemy Two Pointers


0392	Is Subsequence	Easy	String, Dynamic_Programming, Two_Pointers	156	87.74
0125	Valid Palindrome	Easy	Top_Interview_Questions, String, Two_Pointers	353	52.06
0977	Squares of a Sorted Array	Easy	Array, Sorting, Two_Pointers	375	18.43
0026	Remove Duplicates from Sorted Array	Easy	Top_Interview_Questions, Array, Two_Pointers	361	77.19
0042	Trapping Rain Water	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack	196	100.00
0015	3Sum	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers	761	90.55

Udemy Famous Algorithm


0053	Maximum Subarray	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer	662	82.48
0169	Majority Element	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer	460	51.25

Udemy Sorting Algorithms


0912	Sort an Array	Medium	Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Merge_Sort, Bucket_Sort, Counting_Sort, Radix_Sort	606	98.48

Udemy 2D Arrays/Matrix


0304	Range Sum Query 2D - Immutable	Medium	Array, Matrix, Design, Prefix_Sum	1373	85.71
0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix	290	40.17
0054	Spiral Matrix	Medium	Top_Interview_Questions, Array, Matrix, Simulation	224	62.50
0048	Rotate Image	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix	287	46.50
0073	Set Matrix Zeroes	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix	255	100.00
0056	Merge Intervals	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting	320	94.22

Udemy Linked List


0114	Flatten Binary Tree to Linked List	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Linked_List	191	93.10
0445	Add Two Numbers II	Medium	Math, Stack, Linked_List	240	82.61
0328	Odd Even Linked List	Medium	Top_Interview_Questions, Linked_List	216	86.96
0061	Rotate List	Medium	Two_Pointers, Linked_List	193	92.16
0024	Swap Nodes in Pairs	Medium	Top_100_Liked_Questions, Linked_List, Recursion	149	99.39
0876	Middle of the Linked List	Easy	Two_Pointers, Linked_List	136	76.52
0142	Linked List Cycle II	Medium	Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List	192	63.39
0141	Linked List Cycle	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List	223	91.85
0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion	279	45.78
0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion	176	96.25
0160	Intersection of Two Linked Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List	262	83.50
0234	Palindrome Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Stack, Linked_List, Recursion	641	79.53
0138	Copy List with Random Pointer	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List	274	80.58
0025	Reverse Nodes in k-Group	Hard	Top_100_Liked_Questions, Linked_List, Recursion	194	87.72
0146	LRU Cache	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Design, Linked_List, Doubly_Linked_List	1116	97.93
0707	Design Linked List	Medium	Design, Linked_List	243	100.00

Udemy Tree Stack Queue


0144	Binary Tree Preorder Traversal	Easy	Depth_First_Search, Tree, Binary_Tree, Stack	277	37.90
0094	Binary Tree Inorder Traversal	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack	269	38.80
0145	Binary Tree Postorder Traversal	Easy	Depth_First_Search, Tree, Binary_Tree, Stack	211	80.00
0102	Binary Tree Level Order Traversal	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree	332	67.53
0103	Binary Tree Zigzag Level Order Traversal	Medium	Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree	316	34.25
0108	Convert Sorted Array to Binary Search Tree	Easy	Top_Interview_Questions, Array, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer	334	35.39
1008	Construct Binary Search Tree from Preorder Traversal	Medium	Array, Tree, Binary_Tree, Stack, Monotonic_Stack, Binary_Search_Tree	145	100.00
0543	Diameter of Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree	307	43.93
0938	Range Sum of BST	Easy	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	356	55.36
0100	Same Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	208	72.24
0226	Invert Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	233	54.90
0111	Minimum Depth of Binary Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	525	90.51
0104	Maximum Depth of Binary Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	236	83.39
0110	Balanced Binary Tree	Easy	Depth_First_Search, Tree, Binary_Tree	310	63.63
0701	Insert into a Binary Search Tree	Medium	Tree, Binary_Tree, Binary_Search_Tree	311	79.03
0297	Serialize and Deserialize Binary Tree	Hard	Top_Interview_Questions, String, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design	475	78.85
0124	Binary Tree Maximum Path Sum	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree	331	74.42
0098	Validate Binary Search Tree	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	330	41.38
0337	House Robber III	Medium	Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree	282	84.62
0236	Lowest Common Ancestor of a Binary Tree	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree	386	45.21
0968	Binary Tree Cameras	Hard	Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree	176	100.00

Udemy Trie and Heap


0208	Implement Trie (Prefix Tree)	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie	689	61.00
0745	Prefix and Suffix Search	Hard	String, Design, Trie	1638	100.00

Udemy Graph


0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	252	95.41
0133	Clone Graph	Medium	Hash_Table, Depth_First_Search, Breadth_First_Search, Graph	351	60.91
0417	Pacific Atlantic Water Flow	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix	319	100.00

Udemy Dynamic Programming


0120	Triangle	Medium	Array, Dynamic_Programming	194	97.87
0118	Pascal's Triangle	Easy	Top_Interview_Questions, Array, Dynamic_Programming	277	33.22
0119	Pascal's Triangle II	Easy	Array, Dynamic_Programming	157	97.27
0139	Word Break	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization	197	87.17
0152	Maximum Product Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	253	88.42
0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	156	92.24
0213	House Robber II	Medium	Array, Dynamic_Programming	257	59.62
0509	Fibonacci Number	Easy	Dynamic_Programming, Math, Recursion, Memoization	139	82.72
0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization	127	97.06
0064	Minimum Path Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix	222	95.70
0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search	318	82.28
1143	Longest Common Subsequence	Medium	Top_100_Liked_Questions, String, Dynamic_Programming	307	38.36
0072	Edit Distance	Hard	Top_100_Liked_Questions, String, Dynamic_Programming	320	63.53
0044	Wildcard Matching	Hard	Top_Interview_Questions, String, Dynamic_Programming, Greedy, Recursion	401	86.11
0010	Regular Expression Matching	Hard	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Recursion	292	58.58

Udemy Backtracking/Recursion


0022	Generate Parentheses	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking	210	78.51
0039	Combination Sum	Medium	Top_100_Liked_Questions, Array, Backtracking	317	86.85
0216	Combination Sum III	Medium	Array, Backtracking	175	90.91
0078	Subsets	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking	191	97.44
0017	Letter Combinations of a Phone Number	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking	262	73.59
0046	Permutations	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking	186	100.00

Udemy Bit Manipulation


0191	Number of 1 Bits	Easy	Top_Interview_Questions, Bit_Manipulation	237	68.44
0389	Find the Difference	Easy	String, Hash_Table, Sorting, Bit_Manipulation	256	64.81
0190	Reverse Bits	Easy	Top_Interview_Questions, Bit_Manipulation, Divide_and_Conquer	198	81.82
0461	Hamming Distance	Easy	Bit_Manipulation	150	96.15
1009	Complement of Base 10 Integer	Easy	Bit_Manipulation	126	72.73
0338	Counting Bits	Easy	Top_100_Liked_Questions, Dynamic_Programming, Bit_Manipulation	186	99.26
0371	Sum of Two Integers	Medium	Top_Interview_Questions, Math, Bit_Manipulation	129	95.45
0029	Divide Two Integers	Medium	Top_Interview_Questions, Math, Bit_Manipulation	281	31.67

Udemy Design


0155	Min Stack	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design	331	84.88

Algorithms

#	Title	Difficulty	Tag	Time, ms	Time, %
1200	Minimum Absolute Difference	Easy	Array, Sorting	507	75.00
1195	Fizz Buzz Multithreaded	Medium	Concurrency	6	87.26
1192	Critical Connections in a Network	Hard	Depth_First_Search, Graph, Biconnected_Component	1696	60.00
1191	K-Concatenation Maximum Sum	Medium	Array, Dynamic_Programming	389	100.00
1190	Reverse Substrings Between Each Pair of Parentheses	Medium	String, Stack	153	42.86
1189	Maximum Number of Balloons	Easy	String, Hash_Table, Counting	136	98.31
1187	Make Array Strictly Increasing	Hard	Array, Dynamic_Programming, Binary_Search	308	100.00
1186	Maximum Subarray Sum with One Deletion	Medium	Array, Dynamic_Programming	304	50.00
1185	Day of the Week	Easy	Math	127	50.00
1184	Distance Between Bus Stops	Easy	Array	164	57.14
1179	Reformat Department Table	Easy	Database	815	90.95
1178	Number of Valid Words for Each Puzzle	Hard	Array, String, Hash_Table, Bit_Manipulation, Trie	675	100.00
1177	Can Make Palindrome from Substring	Medium	String, Hash_Table, Bit_Manipulation, Prefix_Sum	937	100.00
1175	Prime Arrangements	Easy	Math	129	50.00
1172	Dinner Plate Stacks	Hard	Hash_Table, Stack, Design, Heap_Priority_Queue	1160	50.00
1171	Remove Zero Sum Consecutive Nodes from Linked List	Medium	Hash_Table, Linked_List	194	50.00
1170	Compare Strings by Frequency of the Smallest Character	Medium	Array, String, Hash_Table, Sorting, Binary_Search	221	50.00
1169	Invalid Transactions	Medium	Array, String, Hash_Table, Sorting	362	57.14
1163	Last Substring in Lexicographical Order	Hard	String, Two_Pointers	254	100.00
1162	As Far from Land as Possible	Medium	Array, Dynamic_Programming, Breadth_First_Search, Matrix, Graph_Theory_I_Day_4_Matrix_Related_Problems	362	81.25
1161	Maximum Level Sum of a Binary Tree	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	445	87.50
1160	Find Words That Can Be Formed by Characters	Easy	Array, String, Hash_Table	288	72.22
1158	Market Analysis I	Medium	Database, SQL_I_Day_9_Control_of_Flow	2470	44.76
1157	Online Majority Element In Subarray	Hard	Array, Binary_Search, Design, Segment_Tree, Binary_Indexed_Tree	953	100.00
1156	Swap For Longest Repeated Character Substring	Medium	String, Sliding_Window	195	20.00
1155	Number of Dice Rolls With Target Sum	Medium	Dynamic_Programming	158	80.95
1154	Day of the Year	Easy	String, Math	317	70.00
1148	Article Views I	Easy	LeetCode_Curated_SQL_70, Database, SQL_I_Day_5_Union	806	54.41
1147	Longest Chunked Palindrome Decomposition	Hard	String, Dynamic_Programming, Greedy, Two_Pointers, Hash_Function, Rolling_Hash	148	50.00
1146	Snapshot Array	Medium	Array, Hash_Table, Binary_Search, Design, Binary_Search_II_Day_18	1064	57.14
1145	Binary Tree Coloring Game	Medium	Depth_First_Search, Tree, Binary_Tree	181	100.00
1144	Decrease Elements To Make Array Zigzag	Medium	Array, Greedy	144	100.00
1143	Longest Common Subsequence	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Algorithm_II_Day_17_Dynamic_Programming, Dynamic_Programming_I_Day_19, Udemy_Dynamic_Programming	307	38.36
1141	User Activity for the Past 30 Days I	Easy	LeetCode_Curated_SQL_70, Database, SQL_I_Day_7_Function	790	87.11
1140	Stone Game II	Medium	Array, Dynamic_Programming, Math, Game_Theory	166	93.27
1139	Largest 1-Bordered Square	Medium	Array, Dynamic_Programming, Matrix	224	100.00
1138	Alphabet Board Path	Medium	String, Hash_Table	138	100.00
1137	N-th Tribonacci Number	Easy	Dynamic_Programming, Math, Memoization, Dynamic_Programming_I_Day_1	122	69.35
1131	Maximum of Absolute Value Expression	Medium	Array, Math	333	100.00
1130	Minimum Cost Tree From Leaf Values	Medium	Dynamic_Programming, Greedy, Stack, Monotonic_Stack	145	66.67
1129	Shortest Path with Alternating Colors	Medium	Breadth_First_Search, Graph, Graph_Theory_I_Day_10_Standard_Traversal	241	16.67
1128	Number of Equivalent Domino Pairs	Easy	Array, Hash_Table, Counting	289	80.00
1125	Smallest Sufficient Team	Hard	Array, Dynamic_Programming, Bit_Manipulation, Bitmask	181	100.00
1124	Longest Well-Performing Interval	Medium	Array, Hash_Table, Stack, Prefix_Sum, Monotonic_Stack	313	100.00
1123	Lowest Common Ancestor of Deepest Leaves	Medium	Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	221	66.67
1122	Relative Sort Array	Easy	Array, Hash_Table, Sorting, Counting_Sort	183	90.00
1117	Building H2O	Medium	Concurrency	20	45.16
1116	Print Zero Even Odd	Medium	Concurrency	7	39.21
1115	Print FooBar Alternately	Medium	Concurrency	23	71.25
1114	Print in Order	Easy	Concurrency	13	30.13
1111	Maximum Nesting Depth of Two Valid Parentheses Strings	Medium	String, Stack	207	33.33
1110	Delete Nodes And Return Forest	Medium	Depth_First_Search, Tree, Binary_Tree	223	100.00
1109	Corporate Flight Bookings	Medium	Array, Prefix_Sum	719	100.00
1108	Defanging an IP Address	Easy	String	159	62.10
1106	Parsing A Boolean Expression	Hard	String, Stack, Recursion	205	100.00
1105	Filling Bookcase Shelves	Medium	Array, Dynamic_Programming	175	33.33
1104	Path In Zigzag Labelled Binary Tree	Medium	Math, Tree, Binary_Tree	136	100.00
1103	Distribute Candies to People	Easy	Math, Simulation	129	100.00
1079	Letter Tile Possibilities	Medium	String, Backtracking	144	100.00
1078	Occurrences After Bigram	Easy	String	151	88.24
1075	Project Employees I	Easy	Database	1268	94.71
1074	Number of Submatrices That Sum to Target	Hard	Array, Hash_Table, Matrix, Prefix_Sum	770	100.00
1073	Adding Two Negabinary Numbers	Medium	Array, Math	187	100.00
1072	Flip Columns For Maximum Number of Equal Rows	Medium	Array, Hash_Table, Matrix	536	100.00
1071	Greatest Common Divisor of Strings	Easy	String, Math	150	80.68
1070	Product Sales Analysis III	Medium	Database	1561	95.47
1068	Product Sales Analysis I	Easy	Database	1897	79.88
1061	Lexicographically Smallest Equivalent String	Medium	String, Union_Find	166	100.00
1054	Distant Barcodes	Medium	Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting	622	75.00
1053	Previous Permutation With One Swap	Medium	Array, Greedy	338	25.00
1052	Grumpy Bookstore Owner	Medium	Array, Sliding_Window	268	80.00
1051	Height Checker	Easy	Array, Sorting, Counting_Sort	140	94.37
1050	Actors and Directors Who Cooperated At Least Three Times	Easy	LeetCode_Curated_SQL_70, Database, SQL_I_Day_10_Where	629	81.02
1049	Last Stone Weight II	Medium	Array, Dynamic_Programming	150	100.00
1048	Longest String Chain	Medium	Array, String, Hash_Table, Dynamic_Programming, Two_Pointers	273	75.00
1047	Remove All Adjacent Duplicates In String	Easy	String, Stack	228	94.52
1046	Last Stone Weight	Easy	Array, Heap_Priority_Queue, Level_1_Day_15_Heap	123	100.00
1045	Customers Who Bought All Products	Medium	Database	881	90.47
1044	Longest Duplicate Substring	Hard	String, Binary_Search, Sliding_Window, Hash_Function, Rolling_Hash, Suffix_Array	592	100.00
1043	Partition Array for Maximum Sum	Medium	Array, Dynamic_Programming	194	71.43
1042	Flower Planting With No Adjacent	Medium	Depth_First_Search, Breadth_First_Search, Graph	396	85.71
1041	Robot Bounded In Circle	Medium	String, Math, Simulation	121	100.00
1040	Moving Stones Until Consecutive II	Medium	Array, Math, Sorting, Two_Pointers	287	50.00
1039	Minimum Score Triangulation of Polygon	Medium	Array, Dynamic_Programming	147	100.00
1038	Binary Search Tree to Greater Sum Tree	Medium	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	123	91.67
1037	Valid Boomerang	Easy	Array, Math, Geometry	126	100.00
1036	Escape a Large Maze	Hard	Array, Hash_Table, Depth_First_Search, Breadth_First_Search	387	100.00
1035	Uncrossed Lines	Medium	Array, Dynamic_Programming	162	93.33
1034	Coloring A Border	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix	332	100.00
1033	Moving Stones Until Consecutive	Medium	Math, Brainteaser	139	100.00
1032	Stream of Characters	Hard	Array, String, Design, Trie, Data_Stream	733	100.00
1031	Maximum Sum of Two Non-Overlapping Subarrays	Medium	Array, Dynamic_Programming, Sliding_Window	172	100.00
1030	Matrix Cells in Distance Order	Easy	Array, Math, Sorting, Matrix, Geometry	426	100.00
1029	Two City Scheduling	Medium	Array, Sorting, Greedy	148	100.00
1028	Recover a Tree From Preorder Traversal	Hard	String, Depth_First_Search, Tree, Binary_Tree	246	100.00
1027	Longest Arithmetic Subsequence	Medium	Array, Hash_Table, Dynamic_Programming, Binary_Search	330	100.00
1026	Maximum Difference Between Node and Ancestor	Medium	Depth_First_Search, Tree, Binary_Tree	155	77.78
1025	Divisor Game	Easy	Dynamic_Programming, Math, Game_Theory, Brainteaser	114	93.33
1024	Video Stitching	Medium	Array, Dynamic_Programming, Greedy	141	100.00
1023	Camelcase Matching	Medium	String, Two_Pointers, Trie, String_Matching	149	60.00
1022	Sum of Root To Leaf Binary Numbers	Easy	Depth_First_Search, Tree, Binary_Tree	158	88.89
1021	Remove Outermost Parentheses	Easy	String, Stack	156	60.00
1020	Number of Enclaves	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Graph_Theory_I_Day_3_Matrix_Related_Problems	369	76.26
1019	Next Greater Node In Linked List	Medium	Array, Stack, Linked_List, Monotonic_Stack	472	75.00
1018	Binary Prefix Divisible By 5	Easy	Array	297	100.00
1017	Convert to Base -2	Medium	Math	138	100.00
1016	Binary String With Substrings Representing 1 To N	Medium	String	134	75.00
1015	Smallest Integer Divisible by K	Medium	Hash_Table, Math	123	100.00
1014	Best Sightseeing Pair	Medium	Array, Dynamic_Programming, Dynamic_Programming_I_Day_7	336	66.67
1013	Partition Array Into Three Parts With Equal Sum	Easy	Array, Greedy	328	100.00
1012	Numbers With Repeated Digits	Hard	Dynamic_Programming, Math	123	100.00
1011	Capacity To Ship Packages Within D Days	Medium	Array, Binary_Search	325	66.67
1010	Pairs of Songs With Total Durations Divisible by 60	Medium	Array, Hash_Table, Counting	287	77.78
1009	Complement of Base 10 Integer	Easy	Bit_Manipulation, Udemy_Bit_Manipulation	126	72.73
1008	Construct Binary Search Tree from Preorder Traversal	Medium	Array, Tree, Binary_Tree, Stack, Monotonic_Stack, Binary_Search_Tree, Udemy_Tree_Stack_Queue	145	100.00
1007	Minimum Domino Rotations For Equal Row	Medium	Array, Greedy, Udemy_Arrays	421	50.00
1006	Clumsy Factorial	Medium	Math, Stack, Simulation	127	100.00
1005	Maximize Sum Of Array After K Negations	Easy	Array, Sorting, Greedy	167	100.00
1004	Max Consecutive Ones III	Medium	Array, Binary_Search, Prefix_Sum, Sliding_Window	318	30.95
1003	Check If Word Is Valid After Substitutions	Medium	String, Stack	216	100.00
1002	Find Common Characters	Easy	Array, String, Hash_Table	181	100.00
1001	Grid Illumination	Hard	Array, Hash_Table	801	100.00
1000	Minimum Cost to Merge Stones	Hard	Array, Dynamic_Programming	152	75.00
0999	Available Captures for Rook	Easy	Array, Matrix, Simulation	143	80.00
0998	Maximum Binary Tree II	Medium	Tree, Binary_Tree	157	100.00
0997	Find the Town Judge	Easy	Array, Hash_Table, Graph, Data_Structure_II_Day_19_Graph, Graph_Theory_I_Day_13_Graph_Theory	475	58.62
0996	Number of Squareful Arrays	Hard	Array, Dynamic_Programming, Math, Bit_Manipulation, Backtracking, Bitmask	139	100.00
0995	Minimum Number of K Consecutive Bit Flips	Hard	Array, Bit_Manipulation, Prefix_Sum, Sliding_Window	480	100.00
0994	Rotting Oranges	Medium	Array, Breadth_First_Search, Matrix, Algorithm_I_Day_9_Breadth_First_Search_Depth_First_Search, Level_2_Day_10_Graph/BFS/DFS	164	82.95
0993	Cousins in Binary Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	152	71.43
0992	Subarrays with K Different Integers	Hard	Array, Hash_Table, Counting, Sliding_Window	341	87.50
0991	Broken Calculator	Medium	Math, Greedy	127	100.00
0990	Satisfiability of Equality Equations	Medium	Array, String, Graph, Union_Find	163	100.00
0989	Add to Array-Form of Integer	Easy	Array, Math, Programming_Skills_II_Day_5	350	70.00
0988	Smallest String Starting From Leaf	Medium	String, Depth_First_Search, Tree, Binary_Tree	180	100.00
0987	Vertical Order Traversal of a Binary Tree	Hard	Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	189	66.67
0986	Interval List Intersections	Medium	Array, Two_Pointers, Algorithm_II_Day_4_Two_Pointers	318	60.98
0985	Sum of Even Numbers After Queries	Medium	Array, Simulation	497	71.43
0984	String Without AAA or BBB	Medium	String, Greedy	132	66.67
0983	Minimum Cost For Tickets	Medium	Array, Dynamic_Programming	147	92.80
0982	Triples with Bitwise AND Equal To Zero	Hard	Array, Hash_Table, Bit_Manipulation	227	100.00
0981	Time Based Key-Value Store	Medium	String, Hash_Table, Binary_Search, Design, Binary_Search_II_Day_16	1555	10.00
0980	Unique Paths III	Hard	Array, Matrix, Bit_Manipulation, Backtracking	134	100.00
0979	Distribute Coins in Binary Tree	Medium	Depth_First_Search, Tree, Binary_Tree	165	80.00
0978	Longest Turbulent Subarray	Medium	Array, Dynamic_Programming, Sliding_Window	395	40.00
0977	Squares of a Sorted Array	Easy	Array, Sorting, Two_Pointers, Algorithm_I_Day_2_Two_Pointers, Udemy_Two_Pointers	375	18.43
0976	Largest Perimeter Triangle	Easy	Array, Math, Sorting, Greedy, Programming_Skills_I_Day_3_Conditional_Statements	304	33.33
0975	Odd Even Jump	Hard	Array, Dynamic_Programming, Stack, Ordered_Set, Monotonic_Stack	326	100.00
0974	Subarray Sums Divisible by K	Medium	Array, Hash_Table, Prefix_Sum	334	66.67
0973	K Closest Points to Origin	Medium	Array, Math, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Geometry, Quickselect, Data_Structure_II_Day_21_Heap_Priority_Queue, Programming_Skills_II_Day_8	800	37.89
0972	Equal Rational Numbers	Hard	String, Math	130	100.00
0971	Flip Binary Tree To Match Preorder Traversal	Medium	Depth_First_Search, Tree, Binary_Tree	173	66.67
0970	Powerful Integers	Medium	Hash_Table, Math	136	100.00
0969	Pancake Sorting	Medium	Array, Sorting, Greedy, Two_Pointers	169	100.00
0968	Binary Tree Cameras	Hard	Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Udemy_Tree_Stack_Queue	176	100.00
0967	Numbers With Same Consecutive Differences	Medium	Breadth_First_Search, Backtracking	144	100.00
0966	Vowel Spellchecker	Medium	Array, String, Hash_Table	371	100.00
0965	Univalued Binary Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	138	90.91
0964	Least Operators to Express Number	Hard	Dynamic_Programming, Math	160	100.00
0963	Minimum Area Rectangle II	Medium	Array, Math, Geometry	183	100.00
0962	Maximum Width Ramp	Medium	Array, Stack, Monotonic_Stack	324	100.00
0961	N-Repeated Element in Size 2N Array	Easy	Array, Hash_Table	264	75.00
0960	Delete Columns to Make Sorted III	Hard	Array, String, Dynamic_Programming	200	100.00
0959	Regions Cut By Slashes	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	180	100.00
0958	Check Completeness of a Binary Tree	Medium	Breadth_First_Search, Tree, Binary_Tree	142	96.04
0957	Prison Cells After N Days	Medium	Array, Hash_Table, Math, Bit_Manipulation	172	100.00
0956	Tallest Billboard	Hard	Array, Dynamic_Programming	182	100.00
0955	Delete Columns to Make Sorted II	Medium	Array, String, Greedy	190	100.00
0954	Array of Doubled Pairs	Medium	Array, Hash_Table, Sorting, Greedy	462	100.00
0953	Verifying an Alien Dictionary	Easy	Array, String, Hash_Table, Programming_Skills_I_Day_9_String	137	100.00
0952	Largest Component Size by Common Factor	Hard	Array, Math, Union_Find	538	100.00
0951	Flip Equivalent Binary Trees	Medium	Depth_First_Search, Tree, Binary_Tree	150	100.00
0950	Reveal Cards In Increasing Order	Medium	Array, Sorting, Simulation, Queue	176	100.00
0949	Largest Time for Given Digits	Medium	String, Enumeration	171	100.00
0948	Bag of Tokens	Medium	Array, Sorting, Greedy, Two_Pointers	161	100.00
0947	Most Stones Removed with Same Row or Column	Medium	Depth_First_Search, Graph, Union_Find, Level_2_Day_19_Union_Find	200	100.00
0946	Validate Stack Sequences	Medium	Array, Stack, Simulation	180	74.91
0945	Minimum Increment to Make Array Unique	Medium	Array, Sorting, Greedy, Counting	427	100.00
0944	Delete Columns to Make Sorted	Easy	Array, String	221	75.00
0943	Find the Shortest Superstring	Hard	Array, String, Dynamic_Programming, Bit_Manipulation, Bitmask	1290	100.00
0942	DI String Match	Easy	Array, String, Math, Greedy, Two_Pointers	202	80.00
0941	Valid Mountain Array	Easy	Array	251	51.94
0940	Distinct Subsequences II	Hard	String, Dynamic_Programming	177	100.00
0939	Minimum Area Rectangle	Medium	Array, Hash_Table, Math, Sorting, Geometry	461	100.00
0938	Range Sum of BST	Easy	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Udemy_Tree_Stack_Queue	356	55.36
0937	Reorder Data in Log Files	Easy	Array, String, Sorting	205	81.82
0936	Stamping The Sequence	Hard	String, Greedy, Stack, Queue	196	100.00
0935	Knight Dialer	Medium	Dynamic_Programming	160	100.00
0934	Shortest Bridge	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Graph_Theory_I_Day_6_Matrix_Related_Problems	301	80.95
0933	Number of Recent Calls	Easy	Design, Queue, Data_Stream	476	82.50
0932	Beautiful Array	Medium	Array, Math, Divide_and_Conquer	145	100.00
0931	Minimum Falling Path Sum	Medium	Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_13	201	84.21
0930	Binary Subarrays With Sum	Medium	Array, Hash_Table, Prefix_Sum, Sliding_Window	250	93.75
0929	Unique Email Addresses	Easy	Array, String, Hash_Table	207	89.29
0928	Minimize Malware Spread II	Hard	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	716	100.00
0927	Three Equal Parts	Hard	Array, Math	303	100.00
0926	Flip String to Monotone Increasing	Medium	String, Dynamic_Programming	199	100.00
0925	Long Pressed Name	Easy	String, Two_Pointers	126	92.31
0924	Minimize Malware Spread	Hard	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	791	100.00
0923	3Sum With Multiplicity	Medium	Array, Hash_Table, Sorting, Two_Pointers, Counting	190	100.00
0922	Sort Array By Parity II	Easy	Array, Sorting, Two_Pointers	257	87.50
0921	Minimum Add to Make Parentheses Valid	Medium	String, Greedy, Stack	131	92.59
0920	Number of Music Playlists	Hard	Dynamic_Programming, Math, Combinatorics	136	100.00
0919	Complete Binary Tree Inserter	Medium	Breadth_First_Search, Tree, Binary_Tree, Design	225	100.00
0918	Maximum Sum Circular Subarray	Medium	Array, Dynamic_Programming, Divide_and_Conquer, Queue, Monotonic_Queue, Dynamic_Programming_I_Day_5	339	86.96
0917	Reverse Only Letters	Easy	String, Two_Pointers	126	100.00
0916	Word Subsets	Medium	Array, String, Hash_Table	397	88.89
0915	Partition Array into Disjoint Intervals	Medium	Array	510	76.92
0914	X of a Kind in a Deck of Cards	Easy	Array, Hash_Table, Math, Counting, Number_Theory	238	70.00
0913	Cat and Mouse	Hard	Dynamic_Programming, Math, Graph, Memoization, Topological_Sort, Game_Theory	211	100.00
0912	Sort an Array	Medium	Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Merge_Sort, Bucket_Sort, Counting_Sort, Radix_Sort, Udemy_Sorting_Algorithms	606	98.48
0911	Online Election	Medium	Array, Hash_Table, Binary_Search, Design, Binary_Search_II_Day_20	766	83.33
0910	Smallest Range II	Medium	Array, Math, Sorting, Greedy, Programming_Skills_II_Day_13	234	100.00
0909	Snakes and Ladders	Medium	Array, Breadth_First_Search, Matrix	203	100.00
0908	Smallest Range I	Easy	Array, Math	202	87.50
0907	Sum of Subarray Minimums	Medium	Array, Dynamic_Programming, Stack, Monotonic_Stack	341	100.00
0906	Super Palindromes	Hard	Math, Enumeration	153	100.00
0905	Sort Array By Parity	Easy	Array, Sorting, Two_Pointers	219	75.00
0904	Fruit Into Baskets	Medium	Array, Hash_Table, Sliding_Window	371	100.00
0903	Valid Permutations for DI Sequence	Hard	Dynamic_Programming	140	100.00
0902	Numbers At Most N Given Digit Set	Hard	Array, Dynamic_Programming, Math, Binary_Search	138	100.00
0901	Online Stock Span	Medium	Stack, Design, Monotonic_Stack, Data_Stream	641	75.00
0900	RLE Iterator	Medium	Array, Design, Counting, Iterator	175	83.33
0899	Orderly Queue	Hard	String, Math, Sorting	148	100.00
0898	Bitwise ORs of Subarrays	Medium	Array, Dynamic_Programming, Bit_Manipulation	812	100.00
0897	Increasing Order Search Tree	Easy	Depth_First_Search, Tree, Binary_Tree, Stack, Binary_Search_Tree	128	85.71
0896	Monotonic Array	Easy	Array, Programming_Skills_II_Day_1	576	90.91
0895	Maximum Frequency Stack	Hard	Hash_Table, Stack, Design, Ordered_Set	617	100.00
0894	All Possible Full Binary Trees	Medium	Dynamic_Programming, Tree, Binary_Tree, Recursion, Memoization	257	100.00
0893	Groups of Special-Equivalent Strings	Medium	Array, String, Hash_Table	141	100.00
0892	Surface Area of 3D Shapes	Easy	Array, Math, Matrix, Geometry	180	100.00
0891	Sum of Subsequence Widths	Hard	Array, Math, Sorting	481	100.00
0890	Find and Replace Pattern	Medium	Array, String, Hash_Table	150	100.00
0889	Construct Binary Tree from Preorder and Postorder Traversal	Medium	Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer	168	100.00
0888	Fair Candy Swap	Easy	Array, Hash_Table, Sorting, Binary_Search	318	100.00
0887	Super Egg Drop	Hard	Dynamic_Programming, Math, Binary_Search	119	100.00
0886	Possible Bipartition	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Graph_Theory_I_Day_14_Graph_Theory	397	100.00
0885	Spiral Matrix III	Medium	Array, Matrix, Simulation	265	100.00
0884	Uncommon Words from Two Sentences	Easy	String, Hash_Table	171	100.00
0883	Projection Area of 3D Shapes	Easy	Array, Math, Matrix, Geometry	173	100.00
0882	Reachable Nodes In Subdivided Graph	Hard	Heap_Priority_Queue, Graph, Shortest_Path	434	100.00
0881	Boats to Save People	Medium	Array, Sorting, Greedy, Two_Pointers	370	96.07
0880	Decoded String at Index	Medium	String, Stack	134	100.00
0879	Profitable Schemes	Hard	Array, Dynamic_Programming	198	75.00
0878	Nth Magical Number	Hard	Math, Binary_Search	124	100.00
0877	Stone Game	Medium	Array, Dynamic_Programming, Math, Game_Theory	136	88.24
0876	Middle of the Linked List	Easy	Two_Pointers, Linked_List, Algorithm_I_Day_5_Two_Pointers, Programming_Skills_I_Day_10_Linked_List_and_Tree, Level_1_Day_4_Linked_List, Udemy_Linked_List	136	76.52
0875	Koko Eating Bananas	Medium	Array, Binary_Search, Binary_Search_II_Day_4	267	93.85
0874	Walking Robot Simulation	Medium	Array, Simulation	274	100.00
0873	Length of Longest Fibonacci Subsequence	Medium	Array, Hash_Table, Dynamic_Programming	341	90.00
0872	Leaf-Similar Trees	Easy	Depth_First_Search, Tree, Binary_Tree	140	100.00
0871	Minimum Number of Refueling Stops	Hard	Array, Dynamic_Programming, Greedy, Heap_Priority_Queue	203	92.86
0870	Advantage Shuffle	Medium	Array, Sorting, Greedy	698	100.00
0869	Reordered Power of 2	Medium	Math, Sorting, Counting, Enumeration	145	87.50
0868	Binary Gap	Easy	Bit_Manipulation	142	100.00
0867	Transpose Matrix	Easy	Array, Matrix, Simulation	201	100.00
0866	Prime Palindrome	Medium	Math	143	100.00
0865	Smallest Subtree with all the Deepest Nodes	Medium	Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	147	100.00
0864	Shortest Path to Get All Keys	Hard	Breadth_First_Search, Bit_Manipulation	176	100.00
0863	All Nodes Distance K in Binary Tree	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	147	95.83
0862	Shortest Subarray with Sum at Least K	Hard	Array, Binary_Search, Heap_Priority_Queue, Prefix_Sum, Sliding_Window, Queue, Monotonic_Queue	563	84.62
0861	Score After Flipping Matrix	Medium	Array, Greedy, Matrix, Bit_Manipulation	135	71.43
0860	Lemonade Change	Easy	Array, Greedy, Programming_Skills_II_Day_17	413	86.96
0859	Buddy Strings	Easy	String, Hash_Table	149	91.01
0858	Mirror Reflection	Medium	Math, Geometry	120	100.00
0857	Minimum Cost to Hire K Workers	Hard	Array, Sorting, Greedy, Heap_Priority_Queue	302	100.00
0856	Score of Parentheses	Medium	String, Stack	129	84.62
0855	Exam Room	Medium	Design, Ordered_Set	644	83.33
0854	K-Similar Strings	Hard	String, Breadth_First_Search	136	100.00
0853	Car Fleet	Medium	Array, Sorting, Stack, Monotonic_Stack	757	85.29
0852	Peak Index in a Mountain Array	Easy	Array, Binary_Search, Binary_Search_I_Day_2	433	94.29
0851	Loud and Rich	Medium	Array, Depth_First_Search, Graph, Topological_Sort	347	100.00
0850	Rectangle Area II	Hard	Array, Ordered_Set, Segment_Tree, Line_Sweep	171	100.00
0849	Maximize Distance to Closest Person	Medium	Array	196	88.46
0848	Shifting Letters	Medium	Array, String	537	93.75
0847	Shortest Path Visiting All Nodes	Hard	Dynamic_Programming, Breadth_First_Search, Bit_Manipulation, Graph, Bitmask, Graph_Theory_I_Day_10_Standard_Traversal	164	100.00
0846	Hand of Straights	Medium	Array, Hash_Table, Sorting, Greedy	306	96.15
0845	Longest Mountain in Array	Medium	Array, Dynamic_Programming, Two_Pointers, Enumeration	222	100.00
0844	Backspace String Compare	Easy	String, Two_Pointers, Stack, Simulation, Algorithm_II_Day_4_Two_Pointers, Level_1_Day_14_Stack	126	98.31
0843	Guess the Word	Hard	Array, String, Math, Game_Theory, Interactive	75	100.00
0842	Split Array into Fibonacci Sequence	Medium	String, Backtracking	142	100.00
0841	Keys and Rooms	Medium	Depth_First_Search, Breadth_First_Search, Graph, Data_Structure_II_Day_19_Graph, Graph_Theory_I_Day_7_Standard_Traversal	189	69.23
0840	Magic Squares In Grid	Medium	Array, Math, Matrix	149	100.00
0839	Similar String Groups	Hard	Array, String, Depth_First_Search, Breadth_First_Search, Union_Find	205	100.00
0838	Push Dominoes	Medium	String, Dynamic_Programming, Two_Pointers	270	100.00
0837	New 21 Game	Medium	Dynamic_Programming, Math, Sliding_Window, Probability_and_Statistics	144	75.00
0836	Rectangle Overlap	Easy	Math, Geometry	121	100.00
0835	Image Overlap	Medium	Array, Matrix	163	100.00
0834	Sum of Distances in Tree	Hard	Dynamic_Programming, Depth_First_Search, Tree, Graph	746	100.00
0833	Find And Replace in String	Medium	Array, String, Sorting	158	100.00
0832	Flipping an Image	Easy	Array, Matrix, Two_Pointers, Simulation	190	94.44
0831	Masking Personal Information	Medium	String	149	100.00
0830	Positions of Large Groups	Easy	String	221	100.00
0829	Consecutive Numbers Sum	Hard	Math, Enumeration	151	100.00
0828	Count Unique Characters of All Substrings of a Given String	Hard	String, Hash_Table, Dynamic_Programming	216	100.00
0827	Making A Large Island	Hard	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	985	100.00
0826	Most Profit Assigning Work	Medium	Array, Sorting, Greedy, Binary_Search, Two_Pointers, Binary_Search_II_Day_11	366	100.00
0825	Friends Of Appropriate Ages	Medium	Array, Sorting, Binary_Search, Two_Pointers	278	100.00
0824	Goat Latin	Easy	String	146	100.00
0823	Binary Trees With Factors	Medium	Array, Hash_Table, Dynamic_Programming	298	100.00
0822	Card Flipping Game	Medium	Array, Hash_Table	186	100.00
0821	Shortest Distance to a Character	Easy	Array, String, Two_Pointers	168	88.00
0820	Short Encoding of Words	Medium	Array, String, Hash_Table, Trie	231	100.00
0819	Most Common Word	Easy	String, Hash_Table, Counting	211	83.33
0818	Race Car	Hard	Dynamic_Programming	123	100.00
0817	Linked List Components	Medium	Hash_Table, Linked_List	239	100.00
0816	Ambiguous Coordinates	Medium	String, Backtracking	231	100.00
0815	Bus Routes	Hard	Array, Hash_Table, Breadth_First_Search, Level_2_Day_11_Graph/BFS/DFS	429	100.00
0814	Binary Tree Pruning	Medium	Depth_First_Search, Tree, Binary_Tree	127	100.00
0813	Largest Sum of Averages	Medium	Array, Dynamic_Programming	160	100.00
0812	Largest Triangle Area	Easy	Array, Math, Geometry	156	71.43
0811	Subdomain Visit Count	Medium	Array, String, Hash_Table, Counting	220	100.00
0810	Chalkboard XOR Game	Hard	Array, Math, Bit_Manipulation, Game_Theory, Brainteaser	172	100.00
0809	Expressive Words	Medium	Array, String, Two_Pointers	158	100.00
0808	Soup Servings	Medium	Dynamic_Programming, Math, Probability_and_Statistics	112	100.00
0807	Max Increase to Keep City Skyline	Medium	Array, Greedy, Matrix	158	100.00
0806	Number of Lines To Write String	Easy	Array, String	134	100.00
0805	Split Array With Same Average	Hard	Array, Dynamic_Programming, Math, Bit_Manipulation, Bitmask	142	100.00
0804	Unique Morse Code Words	Easy	Array, String, Hash_Table	158	80.00
0803	Bricks Falling When Hit	Hard	Array, Matrix, Union_Find	742	100.00
0802	Find Eventual Safe States	Medium	Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort, Graph_Theory_I_Day_9_Standard_Traversal	511	100.00
0801	Minimum Swaps To Make Sequences Increasing	Hard	Array, Dynamic_Programming	617	83.33
0799	Champagne Tower	Medium	Dynamic_Programming	153	100.00
0798	Smallest Rotation with Highest Score	Hard	Array, Prefix_Sum	470	100.00
0797	All Paths From Source to Target	Medium	Depth_First_Search, Breadth_First_Search, Graph, Backtracking, Algorithm_II_Day_8_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_7_Standard_Traversal	232	100.00
0796	Rotate String	Easy	String, String_Matching	134	100.00
0795	Number of Subarrays with Bounded Maximum	Medium	Array, Two_Pointers	361	66.67
0794	Valid Tic-Tac-Toe State	Medium	Array, String	138	100.00
0793	Preimage Size of Factorial Zeroes Function	Hard	Math, Binary_Search	114	100.00
0792	Number of Matching Subsequences	Medium	String, Hash_Table, Sorting, Trie	346	100.00
0791	Custom Sort String	Medium	String, Hash_Table, Sorting	133	90.00
0790	Domino and Tromino Tiling	Medium	Dynamic_Programming	116	100.00
0789	Escape The Ghosts	Medium	Array, Math	187	100.00
0788	Rotated Digits	Medium	Dynamic_Programming, Math	137	80.00
0787	Cheapest Flights Within K Stops	Medium	Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Heap_Priority_Queue, Graph, Shortest_Path	185	99.20
0786	K-th Smallest Prime Fraction	Medium	Array, Binary_Search, Heap_Priority_Queue	165	100.00
0785	Is Graph Bipartite?	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Graph_Theory_I_Day_14_Graph_Theory	215	82.35
0784	Letter Case Permutation	Medium	String, Bit_Manipulation, Backtracking, Algorithm_I_Day_11_Recursion_Backtracking	219	84.62
0783	Minimum Distance Between BST Nodes	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	144	96.35
0782	Transform to Chessboard	Hard	Array, Math, Matrix, Bit_Manipulation	188	100.00
0781	Rabbits in Forest	Medium	Array, Hash_Table, Math, Greedy	132	100.00
0780	Reaching Points	Hard	Math	139	100.00
0779	K-th Symbol in Grammar	Medium	Math, Bit_Manipulation, Recursion	114	100.00
0778	Swim in Rising Water	Hard	Array, Depth_First_Search, Breadth_First_Search, Binary_Search, Matrix, Heap_Priority_Queue, Union_Find	190	100.00
0777	Swap Adjacent in LR String	Medium	String, Two_Pointers	188	100.00
0775	Global and Local Inversions	Medium	Array, Math	495	100.00
0773	Sliding Puzzle	Hard	Array, Breadth_First_Search, Matrix	166	100.00
0771	Jewels and Stones	Easy	String, Hash_Table	143	99.08
0770	Basic Calculator IV	Hard	String, Hash_Table, Math, Stack, Recursion	222	100.00
0769	Max Chunks To Make Sorted	Medium	Array, Sorting, Greedy, Stack, Monotonic_Stack	136	90.00
0768	Max Chunks To Make Sorted II	Hard	Array, Sorting, Greedy, Stack, Monotonic_Stack	202	100.00
0767	Reorganize String	Medium	String, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting	148	100.00
0766	Toeplitz Matrix	Easy	Array, Matrix	174	100.00
0765	Couples Holding Hands	Hard	Depth_First_Search, Greedy, Breadth_First_Search, Graph, Union_Find	131	100.00
0764	Largest Plus Sign	Medium	Array, Dynamic_Programming	415	100.00
0763	Partition Labels	Medium	Top_100_Liked_Questions, String, Hash_Table, Greedy, Two_Pointers, Data_Structure_II_Day_7_String	235	84.75
0762	Prime Number of Set Bits in Binary Representation	Easy	Math, Bit_Manipulation	147	100.00
0761	Special Binary String	Hard	String, Recursion	128	100.00
0757	Set Intersection Size At Least Two	Hard	Array, Sorting, Greedy	298	100.00
0756	Pyramid Transition Matrix	Medium	Depth_First_Search, Breadth_First_Search, Bit_Manipulation	268	100.00
0754	Reach a Number	Medium	Math, Binary_Search	134	100.00
0753	Cracking the Safe	Hard	Depth_First_Search, Graph, Eulerian_Circuit	147	100.00
0752	Open the Lock	Medium	Array, String, Hash_Table, Breadth_First_Search, Graph_Theory_I_Day_12_Breadth_First_Search	310	100.00
0749	Contain Virus	Hard	Array, Depth_First_Search, Breadth_First_Search, Matrix, Simulation	201	100.00
0748	Shortest Completing Word	Easy	Array, String, Hash_Table	172	100.00
0747	Largest Number At Least Twice of Others	Easy	Array, Sorting	147	98.21
0746	Min Cost Climbing Stairs	Easy	Array, Dynamic_Programming, Dynamic_Programming_I_Day_2, Level_1_Day_11_Dynamic_Programming	171	96.76
0745	Prefix and Suffix Search	Hard	String, Design, Trie, Udemy_Trie_and_Heap	1638	100.00
0744	Find Smallest Letter Greater Than Target	Easy	Array, Binary_Search, Binary_Search_I_Day_4	162	100.00
0743	Network Delay Time	Medium	Depth_First_Search, Breadth_First_Search, Heap_Priority_Queue, Graph, Shortest_Path	321	98.55
0741	Cherry Pickup	Hard	Array, Dynamic_Programming, Matrix	196	100.00
0740	Delete and Earn	Medium	Array, Hash_Table, Dynamic_Programming, Dynamic_Programming_I_Day_3	192	100.00
0739	Daily Temperatures	Medium	Top_100_Liked_Questions, Array, Stack, Monotonic_Stack, Programming_Skills_II_Day_6	936	80.54
0738	Monotone Increasing Digits	Medium	Math, Greedy	127	100.00
0736	Parse Lisp Expression	Hard	String, Hash_Table, Stack, Recursion	172	100.00
0735	Asteroid Collision	Medium	Array, Stack, Level_2_Day_18_Stack	243	100.00
0733	Flood Fill	Easy	Array, Depth_First_Search, Breadth_First_Search, Matrix, Algorithm_I_Day_7_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_1_Matrix_Related_Problems, Level_1_Day_9_Graph/BFS/DFS	230	97.76
0732	My Calendar III	Hard	Binary_Search, Design, Ordered_Set, Segment_Tree	294	100.00
0731	My Calendar II	Medium	Binary_Search, Design, Ordered_Set, Segment_Tree	371	100.00
0730	Count Different Palindromic Subsequences	Hard	String, Dynamic_Programming	233	100.00
0729	My Calendar I	Medium	Binary_Search, Design, Ordered_Set, Segment_Tree, Programming_Skills_II_Day_20	378	69.70
0728	Self Dividing Numbers	Easy	Math	142	100.00
0726	Number of Atoms	Hard	String, Hash_Table, Sorting, Stack	149	100.00
0725	Split Linked List in Parts	Medium	Linked_List	162	95.00
0724	Find Pivot Index	Easy	Array, Prefix_Sum, Level_1_Day_1_Prefix_Sum	255	88.92
0722	Remove Comments	Medium	Array, String	164	100.00
0721	Accounts Merge	Medium	Array, String, Depth_First_Search, Breadth_First_Search, Union_Find	364	100.00
0720	Longest Word in Dictionary	Medium	Array, String, Hash_Table, Sorting, Trie	209	100.00
0719	Find K-th Smallest Pair Distance	Hard	Array, Sorting, Binary_Search, Two_Pointers	172	100.00
0718	Maximum Length of Repeated Subarray	Medium	Array, Dynamic_Programming, Binary_Search, Sliding_Window, Hash_Function, Rolling_Hash	270	91.43
0717	1-bit and 2-bit Characters	Easy	Array	165	100.00
0715	Range Module	Hard	Design, Ordered_Set, Segment_Tree	638	58.33
0714	Best Time to Buy and Sell Stock with Transaction Fee	Medium	Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_8	417	90.91
0713	Subarray Product Less Than K	Medium	Array, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Programming_Skills_II_Day_12, Udemy_Arrays	336	92.11
0712	Minimum ASCII Delete Sum for Two Strings	Medium	String, Dynamic_Programming	176	100.00
0710	Random Pick with Blacklist	Hard	Hash_Table, Math, Sorting, Binary_Search, Randomized	632	100.00
0709	To Lower Case	Easy	String, Programming_Skills_I_Day_9_String	142	98.68
0707	Design Linked List	Medium	Design, Linked_List, Data_Structure_II_Day_12_Linked_List, Programming_Skills_II_Day_19, Udemy_Linked_List	243	100.00
0706	Design HashMap	Easy	Array, Hash_Table, Design, Linked_List, Hash_Function, Data_Structure_II_Day_2_Array	405	92.11
0705	Design HashSet	Easy	Array, Hash_Table, Design, Linked_List, Hash_Function	385	75.61
0704	Binary Search	Easy	Array, Binary_Search, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_1, Level_1_Day_7_Binary_Search, Udemy_Binary_Search	261	77.91
0703	Kth Largest Element in a Stream	Easy	Tree, Binary_Tree, Design, Heap_Priority_Queue, Binary_Search_Tree, Data_Stream	286	95.45
0701	Insert into a Binary Search Tree	Medium	Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_13_Tree, Udemy_Tree_Stack_Queue	311	79.03
0700	Search in a Binary Search Tree	Easy	Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_13_Tree	251	88.31
0699	Falling Squares	Hard	Array, Ordered_Set, Segment_Tree	293	100.00
0698	Partition to K Equal Sum Subsets	Medium	Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask, Memoization	191	100.00
0697	Degree of an Array	Easy	Array, Hash_Table, Udemy_Arrays	289	84.62
0696	Count Binary Substrings	Easy	String, Two_Pointers	222	100.00
0695	Max Area of Island	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Algorithm_I_Day_7_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_2_Matrix_Related_Problems	324	24.06
0693	Binary Number with Alternating Bits	Easy	Bit_Manipulation	129	100.00
0692	Top K Frequent Words	Medium	String, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Trie, Bucket_Sort, Level_1_Day_15_Heap	239	81.10
0691	Stickers to Spell Word	Hard	Array, String, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask	249	100.00
0690	Employee Importance	Medium	Hash_Table, Depth_First_Search, Breadth_First_Search	255	100.00
0689	Maximum Sum of 3 Non-Overlapping Subarrays	Hard	Array, Dynamic_Programming	248	100.00
0688	Knight Probability in Chessboard	Medium	Dynamic_Programming	144	100.00
0687	Longest Univalue Path	Medium	Depth_First_Search, Tree, Binary_Tree	303	100.00
0686	Repeated String Match	Medium	String, String_Matching	164	100.00
0685	Redundant Connection II	Hard	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	176	100.00
0684	Redundant Connection	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	181	88.24
0682	Baseball Game	Easy	Array, Stack, Simulation	159	100.00
0680	Valid Palindrome II	Easy	String, Greedy, Two_Pointers	296	79.17
0679	24 Game	Hard	Array, Math, Backtracking	175	100.00
0678	Valid Parenthesis String	Medium	String, Dynamic_Programming, Greedy, Stack	133	100.00
0677	Map Sum Pairs	Medium	String, Hash_Table, Design, Trie	197	80.00
0676	Implement Magic Dictionary	Medium	String, Hash_Table, Design, Trie	256	100.00
0675	Cut Off Trees for Golf Event	Hard	Array, Breadth_First_Search, Matrix, Heap_Priority_Queue	777	100.00
0674	Longest Continuous Increasing Subsequence	Easy	Array	201	84.21
0673	Number of Longest Increasing Subsequence	Medium	Array, Dynamic_Programming, Segment_Tree, Binary_Indexed_Tree, Algorithm_II_Day_16_Dynamic_Programming	226	91.67
0672	Bulb Switcher II	Medium	Math, Depth_First_Search, Breadth_First_Search, Bit_Manipulation	131	100.00
0671	Second Minimum Node In a Binary Tree	Easy	Depth_First_Search, Tree, Binary_Tree	128	100.00
0670	Maximum Swap	Medium	Math, Greedy	143	100.00
0669	Trim a Binary Search Tree	Medium	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	195	100.00
0668	Kth Smallest Number in Multiplication Table	Hard	Math, Binary_Search	151	100.00
0667	Beautiful Arrangement II	Medium	Array, Math	175	100.00
0665	Non-decreasing Array	Medium	Array	256	85.71
0664	Strange Printer	Hard	String, Dynamic_Programming	196	100.00
0662	Maximum Width of Binary Tree	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	189	75.00
0661	Image Smoother	Easy	Array, Matrix	352	100.00
0659	Split Array into Consecutive Subsequences	Medium	Array, Hash_Table, Greedy, Heap_Priority_Queue	352	100.00
0658	Find K Closest Elements	Medium	Array, Sorting, Binary_Search, Two_Pointers, Heap_Priority_Queue, Binary_Search_II_Day_2	375	95.16
0657	Robot Return to Origin	Easy	String, Simulation	186	100.00
0655	Print Binary Tree	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	176	100.00
0654	Maximum Binary Tree	Medium	Array, Tree, Binary_Tree, Stack, Monotonic_Stack, Divide_and_Conquer	271	90.00
0653	Two Sum IV - Input is a BST	Easy	Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Two_Pointers, Binary_Search_Tree, Data_Structure_I_Day_14_Tree	231	96.08
0652	Find Duplicate Subtrees	Medium	Hash_Table, Depth_First_Search, Tree, Binary_Tree	266	76.00
0650	2 Keys Keyboard	Medium	Dynamic_Programming, Math	115	100.00
0649	Dota2 Senate	Medium	String, Greedy, Queue	217	100.00
0648	Replace Words	Medium	Array, String, Hash_Table, Trie	392	100.00
0647	Palindromic Substrings	Medium	Top_100_Liked_Questions, String, Dynamic_Programming	266	67.83
0646	Maximum Length of Pair Chain	Medium	Array, Dynamic_Programming, Sorting, Greedy	249	100.00
0645	Set Mismatch	Easy	Array, Hash_Table, Sorting, Bit_Manipulation	246	88.46
0643	Maximum Average Subarray I	Easy	Array, Sliding_Window	494	98.65
0641	Design Circular Deque	Medium	Array, Design, Linked_List, Queue	232	100.00
0640	Solve the Equation	Medium	String, Math, Simulation	170	66.67
0639	Decode Ways II	Hard	String, Dynamic_Programming	259	100.00
0638	Shopping Offers	Medium	Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask, Memoization	195	100.00
0637	Average of Levels in Binary Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	249	100.00
0636	Exclusive Time of Functions	Medium	Array, Stack	270	80.00
0633	Sum of Square Numbers	Medium	Math, Binary_Search, Two_Pointers, Binary_Search_I_Day_10	126	100.00
0632	Smallest Range Covering Elements from K Lists	Hard	Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Sliding_Window	399	83.33
0630	Course Schedule III	Hard	Array, Greedy, Heap_Priority_Queue	536	100.00
0629	K Inverse Pairs Array	Hard	Dynamic_Programming	155	100.00
0628	Maximum Product of Three Numbers	Easy	Array, Math, Sorting	276	97.30
0627	Swap Salary	Easy	Database, SQL_I_Day_2_Select_and_Order	400	51.04
0626	Exchange Seats	Medium	Database	502	50.56
0623	Add One Row to Tree	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	202	100.00
0622	Design Circular Queue	Medium	Array, Design, Linked_List, Queue, Programming_Skills_II_Day_20	234	92.68
0621	Task Scheduler	Medium	Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting, Level_2_Day_5_Greedy	266	98.36
0620	Not Boring Movies	Easy	Database	305	59.80
0619	Biggest Single Number	Easy	Database	656	90.69
0617	Merge Two Binary Trees	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Algorithm_I_Day_8_Breadth_First_Search_Depth_First_Search	243	72.83
0611	Valid Triangle Number	Medium	Array, Sorting, Greedy, Binary_Search, Two_Pointers, Binary_Search_II_Day_1	203	100.00
0610	Triangle Judgement	Easy	Database	464	72.35
0609	Find Duplicate File in System	Medium	Array, String, Hash_Table	426	100.00
0608	Tree Node	Medium	LeetCode_Curated_SQL_70, Database, SQL_I_Day_4_Union_and_Select	794	48.38
0607	Sales Person	Easy	LeetCode_Curated_SQL_70, Database, SQL_I_Day_6_Union	2142	44.56
0606	Construct String from Binary Tree	Easy	String, Depth_First_Search, Tree, Binary_Tree	187	100.00
0605	Can Place Flowers	Easy	Array, Greedy, Udemy_Arrays	209	85.71
0602	Friend Requests II: Who Has the Most Friends	Medium	Database	398	97.39
0601	Human Traffic of Stadium	Hard	Database	529	51.80
0600	Non-negative Integers without Consecutive Ones	Hard	Dynamic_Programming	142	100.00
0599	Minimum Index Sum of Two Lists	Easy	Array, String, Hash_Table	293	100.00
0598	Range Addition II	Easy	Array, Math	176	66.67
0596	Classes More Than 5 Students	Easy	Database	484	50.92
0595	Big Countries	Easy	Database, SQL_I_Day_1_Select	417	56.09
0594	Longest Harmonious Subsequence	Easy	Array, Hash_Table, Sorting	331	100.00
0593	Valid Square	Medium	Math, Geometry	161	83.33
0592	Fraction Addition and Subtraction	Medium	String, Math, Simulation	164	100.00
0591	Tag Validator	Hard	String, Stack	177	100.00
0590	N-ary Tree Postorder Traversal	Easy	Depth_First_Search, Tree, Stack	237	88.10
0589	N-ary Tree Preorder Traversal	Easy	Depth_First_Search, Tree, Stack, Programming_Skills_I_Day_5_Function, Level_1_Day_6_Tree	233	84.02
0587	Erect the Fence	Hard	Array, Math, Geometry	470	100.00
0586	Customer Placing the Largest Number of Orders	Easy	LeetCode_Curated_SQL_70, Database, SQL_I_Day_8_Function	768	44.85
0585	Investments in 2016	Medium	Database	729	99.22
0584	Find Customer Referee	Easy	Database, SQL_I_Day_1_Select	779	43.48
0583	Delete Operation for Two Strings	Medium	String, Dynamic_Programming, Algorithm_II_Day_17_Dynamic_Programming	197	100.00
0581	Shortest Unsorted Continuous Subarray	Medium	Array, Sorting, Greedy, Two_Pointers, Stack, Monotonic_Stack	246	100.00
0577	Employee Bonus	Easy	Database	1473	95.83
0576	Out of Boundary Paths	Medium	Dynamic_Programming	153	100.00
0575	Distribute Candies	Easy	Array, Hash_Table	538	76.92
0572	Subtree of Another Tree	Easy	Depth_First_Search, Tree, Binary_Tree, Hash_Function, String_Matching, Algorithm_II_Day_7_Breadth_First_Search_Depth_First_Search	214	92.39
0570	Managers with at Least 5 Direct Reports	Medium	Database	454	90.82
0567	Permutation in String	Medium	String, Hash_Table, Two_Pointers, Sliding_Window, Algorithm_I_Day_6_Sliding_Window	169	100.00
0566	Reshape the Matrix	Easy	Array, Matrix, Simulation, Data_Structure_I_Day_4_Array, Programming_Skills_I_Day_7_Array	239	99.05
0565	Array Nesting	Medium	Array, Depth_First_Search	553	100.00
0564	Find the Closest Palindrome	Hard	String, Math	179	100.00
0563	Binary Tree Tilt	Easy	Depth_First_Search, Tree, Binary_Tree	197	100.00
0561	Array Partition	Easy	Array, Sorting, Greedy, Counting_Sort	337	90.48
0560	Subarray Sum Equals K	Medium	Top_100_Liked_Questions, Array, Hash_Table, Prefix_Sum, Data_Structure_II_Day_5_Array	692	53.27
0559	Maximum Depth of N-ary Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree	196	100.00
0558	Logical OR of Two Binary Grids Represented as Quad-Trees	Medium	Tree, Divide_and_Conquer	268	100.00
0557	Reverse Words in a String III	Easy	String, Two_Pointers, Algorithm_I_Day_4_Two_Pointers	215	98.10
0556	Next Greater Element III	Medium	String, Math, Two_Pointers, Programming_Skills_II_Day_10	137	80.00
0554	Brick Wall	Medium	Array, Hash_Table	307	100.00
0553	Optimal Division	Medium	Array, Dynamic_Programming, Math	154	100.00
0552	Student Attendance Record II	Hard	Dynamic_Programming	151	100.00
0551	Student Attendance Record I	Easy	String	151	95.00
0550	Game Play Analysis IV	Medium	Database	762	97.74
0547	Number of Provinces	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Algorithm_II_Day_6_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_8_Standard_Traversal, Level_2_Day_19_Union_Find	229	79.73
0546	Remove Boxes	Hard	Array, Dynamic_Programming, Memoization	283	100.00
0543	Diameter of Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Level_2_Day_7_Tree, Udemy_Tree_Stack_Queue	307	43.93
0542	01 Matrix	Medium	Array, Dynamic_Programming, Breadth_First_Search, Matrix, Algorithm_I_Day_9_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_5_Matrix_Related_Problems	441	94.06
0541	Reverse String II	Easy	String, Two_Pointers	200	83.33
0540	Single Element in a Sorted Array	Medium	Array, Binary_Search, Binary_Search_II_Day_9	274	86.67
0539	Minimum Time Difference	Medium	Array, String, Math, Sorting	183	100.00
0538	Convert BST to Greater Tree	Medium	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	252	77.78
0537	Complex Number Multiplication	Medium	String, Math, Simulation	171	75.00
0535	Encode and Decode TinyURL	Medium	String, Hash_Table, Design, Hash_Function	183	81.25
0532	K-diff Pairs in an Array	Medium	Array, Hash_Table, Sorting, Binary_Search, Two_Pointers, Udemy_Arrays	230	84.62
0530	Minimum Absolute Difference in BST	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	209	86.96
0529	Minesweeper	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix	243	87.50
0528	Random Pick with Weight	Medium	Math, Binary_Search, Prefix_Sum, Randomized, Binary_Search_II_Day_13	393	91.38
0526	Beautiful Arrangement	Medium	Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask	107	100.00
0525	Contiguous Array	Medium	Array, Hash_Table, Prefix_Sum	471	100.00
0524	Longest Word in Dictionary through Deleting	Medium	Array, String, Sorting, Two_Pointers	307	100.00
0523	Continuous Subarray Sum	Medium	Array, Hash_Table, Math, Prefix_Sum	682	95.45
0522	Longest Uncommon Subsequence II	Medium	Array, String, Hash_Table, Sorting, Two_Pointers	163	100.00
0521	Longest Uncommon Subsequence I	Easy	String	146	88.89
0520	Detect Capital	Easy	String	161	84.54
0519	Random Flip Matrix	Medium	Hash_Table, Math, Randomized, Reservoir_Sampling	270	100.00
0518	Coin Change II	Medium	Array, Dynamic_Programming, Dynamic_Programming_I_Day_20	139	100.00
0517	Super Washing Machines	Hard	Array, Greedy	210	100.00
0516	Longest Palindromic Subsequence	Medium	String, Dynamic_Programming, Dynamic_Programming_I_Day_17	243	87.50
0515	Find Largest Value in Each Tree Row	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	238	73.33
0514	Freedom Trail	Hard	String, Dynamic_Programming, Depth_First_Search, Breadth_First_Search	182	100.00
0513	Find Bottom Left Tree Value	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	190	88.24
0511	Game Play Analysis I	Easy	LeetCode_Curated_SQL_70, Database, SQL_I_Day_8_Function	790	45.04
0509	Fibonacci Number	Easy	Dynamic_Programming, Math, Recursion, Memoization, Dynamic_Programming_I_Day_1, Level_1_Day_10_Dynamic_Programming, Udemy_Dynamic_Programming	139	82.72
0508	Most Frequent Subtree Sum	Medium	Hash_Table, Depth_First_Search, Tree, Binary_Tree	246	80.00
0507	Perfect Number	Easy	Math	172	81.82
0506	Relative Ranks	Easy	Array, Sorting, Heap_Priority_Queue	244	94.23
0504	Base 7	Easy	Math	136	100.00
0503	Next Greater Element II	Medium	Array, Stack, Monotonic_Stack, Programming_Skills_II_Day_10	331	92.68
0502	IPO	Hard	Array, Sorting, Greedy, Heap_Priority_Queue	799	54.55
0501	Find Mode in Binary Search Tree	Easy	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	235	86.67
0500	Keyboard Row	Easy	Array, String, Hash_Table	170	85.19
0498	Diagonal Traverse	Medium	Array, Matrix, Simulation	430	61.54
0497	Random Point in Non-overlapping Rectangles	Medium	Math, Binary_Search, Prefix_Sum, Ordered_Set, Randomized, Reservoir_Sampling	759	100.00
0496	Next Greater Element I	Easy	Array, Hash_Table, Stack, Monotonic_Stack, Programming_Skills_I_Day_5_Function	171	100.00
0495	Teemo Attacking	Easy	Array, Simulation	283	100.00
0494	Target Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Backtracking	308	89.61
0493	Reverse Pairs	Hard	Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort	887	66.67
0492	Construct the Rectangle	Easy	Math	202	88.89
0491	Non-decreasing Subsequences	Medium	Array, Hash_Table, Bit_Manipulation, Backtracking	499	100.00
0488	Zuma Game	Hard	String, Dynamic_Programming, Breadth_First_Search, Memoization	1727	100.00
0486	Predict the Winner	Medium	Array, Dynamic_Programming, Math, Recursion, Game_Theory	158	84.62
0485	Max Consecutive Ones	Easy	Array	272	88.46
0483	Smallest Good Base	Hard	Math, Binary_Search	164	100.00
0482	License Key Formatting	Easy	String	234	87.18
0481	Magical String	Medium	String, Two_Pointers	124	100.00
0480	Sliding Window Median	Hard	Array, Hash_Table, Heap_Priority_Queue, Sliding_Window	409	100.00
0479	Largest Palindrome Product	Hard	Math	147	100.00
0478	Generate Random Point in a Circle	Medium	Math, Geometry, Randomized, Rejection_Sampling	862	100.00
0477	Total Hamming Distance	Medium	Array, Math, Bit_Manipulation	298	100.00
0476	Number Complement	Easy	Bit_Manipulation	133	100.00
0475	Heaters	Medium	Array, Sorting, Binary_Search, Two_Pointers	356	87.50
0474	Ones and Zeroes	Medium	Array, String, Dynamic_Programming	204	100.00
0473	Matchsticks to Square	Medium	Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask	255	100.00
0472	Concatenated Words	Hard	Array, String, Dynamic_Programming, Depth_First_Search, Trie	484	100.00
0470	Implement Rand10() Using Rand7()	Medium	Math, Randomized, Probability_and_Statistics, Rejection_Sampling	220	100.00
0468	Validate IP Address	Medium	String	192	62.50
0467	Unique Substrings in Wraparound String	Medium	String, Dynamic_Programming	197	100.00
0466	Count The Repetitions	Hard	String, Dynamic_Programming	147	100.00
0464	Can I Win	Medium	Dynamic_Programming, Math, Bit_Manipulation, Bitmask, Memoization, Game_Theory	213	100.00
0463	Island Perimeter	Easy	Array, Depth_First_Search, Breadth_First_Search, Matrix	381	98.04
0462	Minimum Moves to Equal Array Elements II	Medium	Array, Math, Sorting	210	100.00
0461	Hamming Distance	Easy	Bit_Manipulation, Udemy_Bit_Manipulation	150	96.15
0460	LFU Cache	Hard	Hash_Table, Design, Linked_List, Doubly_Linked_List	1143	100.00
0459	Repeated Substring Pattern	Easy	String, String_Matching, Programming_Skills_II_Day_2	201	100.00
0458	Poor Pigs	Hard	Dynamic_Programming, Math, Combinatorics	133	80.00
0457	Circular Array Loop	Medium	Array, Hash_Table, Two_Pointers	143	100.00
0456	132 Pattern	Medium	Array, Binary_Search, Stack, Ordered_Set, Monotonic_Stack, Udemy_Arrays	434	100.00
0455	Assign Cookies	Easy	Array, Sorting, Greedy	260	96.67
0454	4Sum II	Medium	Top_Interview_Questions, Array, Hash_Table	660	85.71
0453	Minimum Moves to Equal Array Elements	Medium	Array, Math	282	100.00
0452	Minimum Number of Arrows to Burst Balloons	Medium	Array, Sorting, Greedy	934	100.00
0451	Sort Characters By Frequency	Medium	String, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Bucket_Sort, Data_Structure_II_Day_21_Heap_Priority_Queue	288	81.72
0450	Delete Node in a BST	Medium	Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_II_Day_16_Tree	257	84.62
0449	Serialize and Deserialize BST	Medium	String, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design, Binary_Search_Tree	233	100.00
0448	Find All Numbers Disappeared in an Array	Easy	Array, Hash_Table, Udemy_Arrays	394	100.00
0447	Number of Boomerangs	Medium	Array, Hash_Table, Math	308	100.00
0446	Arithmetic Slices II - Subsequence	Hard	Array, Dynamic_Programming	312	100.00
0445	Add Two Numbers II	Medium	Math, Stack, Linked_List, Programming_Skills_II_Day_15, Udemy_Linked_List	240	82.61
0443	String Compression	Medium	String, Two_Pointers	198	92.68
0442	Find All Duplicates in an Array	Medium	Array, Hash_Table, Udemy_Arrays	480	73.81
0441	Arranging Coins	Easy	Math, Binary_Search, Binary_Search_I_Day_6	150	84.21
0440	K-th Smallest in Lexicographical Order	Hard	Trie	149	100.00
0438	Find All Anagrams in a String	Medium	Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Programming_Skills_II_Day_12, Level_1_Day_12_Sliding_Window/Two_Pointer	561	54.68
0437	Path Sum III	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Level_2_Day_7_Tree	403	54.12
0436	Find Right Interval	Medium	Array, Sorting, Binary_Search, Binary_Search_II_Day_11	333	100.00
0435	Non-overlapping Intervals	Medium	Array, Dynamic_Programming, Sorting, Greedy, Data_Structure_II_Day_4_Array	1040	85.07
0434	Number of Segments in a String	Easy	String	167	80.00
0433	Minimum Genetic Mutation	Medium	String, Hash_Table, Breadth_First_Search, Graph_Theory_I_Day_12_Breadth_First_Search	204	82.08
0432	All O`one Data Structure	Hard	Hash_Table, Design, Linked_List, Doubly_Linked_List	1200	100.00
0430	Flatten a Multilevel Doubly Linked List	Medium	Depth_First_Search, Linked_List, Doubly_Linked_List	194	97.44
0429	N-ary Tree Level Order Traversal	Medium	Breadth_First_Search, Tree, Programming_Skills_II_Day_9	248	75.86
0427	Construct Quad Tree	Medium	Array, Tree, Matrix, Divide_and_Conquer	221	94.74
0424	Longest Repeating Character Replacement	Medium	String, Hash_Table, Sliding_Window, Level_1_Day_12_Sliding_Window/Two_Pointer	288	84.38
0423	Reconstruct Original Digits from English	Medium	String, Hash_Table, Math	349	100.00
0421	Maximum XOR of Two Numbers in an Array	Medium	Array, Hash_Table, Bit_Manipulation, Trie	710	100.00
0420	Strong Password Checker	Hard	String, Greedy, Heap_Priority_Queue	157	80.00
0419	Battleships in a Board	Medium	Array, Depth_First_Search, Matrix	273	76.92
0417	Pacific Atlantic Water Flow	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Graph_Theory_I_Day_4_Matrix_Related_Problems, Level_2_Day_10_Graph/BFS/DFS, Udemy_Graph	319	100.00
0416	Partition Equal Subset Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Level_2_Day_13_Dynamic_Programming	204	98.82
0415	Add Strings	Easy	String, Math, Simulation, Data_Structure_II_Day_6_String	296	76.00
0414	Third Maximum Number	Easy	Array, Sorting	317	73.00
0413	Arithmetic Slices	Medium	Array, Dynamic_Programming, Algorithm_II_Day_14_Dynamic_Programming, Dynamic_Programming_I_Day_10	156	100.00
0412	Fizz Buzz	Easy	Top_Interview_Questions, String, Math, Simulation, Udemy_Integers	307	71.81
0410	Split Array Largest Sum	Hard	Array, Dynamic_Programming, Greedy, Binary_Search	165	100.00
0409	Longest Palindrome	Easy	String, Hash_Table, Greedy, Data_Structure_II_Day_6_String, Level_1_Day_5_Greedy	259	60.71
0407	Trapping Rain Water II	Hard	Array, Breadth_First_Search, Matrix, Heap_Priority_Queue	500	100.00
0406	Queue Reconstruction by Height	Medium	Array, Sorting, Greedy, Segment_Tree, Binary_Indexed_Tree	306	100.00
0405	Convert a Number to Hexadecimal	Easy	Math, Bit_Manipulation	132	100.00
0404	Sum of Left Leaves	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Programming_Skills_I_Day_10_Linked_List_and_Tree	173	86.05
0403	Frog Jump	Hard	Array, Dynamic_Programming	240	100.00
0402	Remove K Digits	Medium	String, Greedy, Stack, Monotonic_Stack	375	75.00
0401	Binary Watch	Easy	Bit_Manipulation, Backtracking	266	71.43
0400	Nth Digit	Medium	Math, Binary_Search	271	50.00
0399	Evaluate Division	Medium	Array, Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Shortest_Path	183	91.49
0398	Random Pick Index	Medium	Hash_Table, Math, Randomized, Reservoir_Sampling	1091	75.00
0397	Integer Replacement	Medium	Dynamic_Programming, Greedy, Bit_Manipulation, Memoization	145	87.50
0396	Rotate Function	Medium	Array, Dynamic_Programming, Math	571	87.50
0395	Longest Substring with At Least K Repeating Characters	Medium	Top_Interview_Questions, String, Hash_Table, Sliding_Window, Divide_and_Conquer	274	66.67
0394	Decode String	Medium	Top_100_Liked_Questions, String, Stack, Recursion, Level_1_Day_14_Stack, Udemy_Strings	224	64.86
0393	UTF-8 Validation	Medium	Array, Bit_Manipulation	219	100.00
0392	Is Subsequence	Easy	String, Dynamic_Programming, Two_Pointers, Dynamic_Programming_I_Day_19, Level_1_Day_2_String, Udemy_Two_Pointers	156	87.74
0391	Perfect Rectangle	Hard	Array, Line_Sweep	897	100.00
0390	Elimination Game	Medium	Math, Recursion	319	55.56
0389	Find the Difference	Easy	String, Hash_Table, Sorting, Bit_Manipulation, Programming_Skills_I_Day_8_String, Udemy_Bit_Manipulation	256	64.81
0388	Longest Absolute File Path	Medium	String, Depth_First_Search, Stack	150	100.00
0387	First Unique Character in a String	Easy	Top_Interview_Questions, String, Hash_Table, Counting, Queue, Data_Structure_I_Day_6_String	369	82.68
0386	Lexicographical Numbers	Medium	Depth_First_Search, Trie	463	83.33
0385	Mini Parser	Medium	String, Depth_First_Search, Stack	210	100.00
0384	Shuffle an Array	Medium	Top_Interview_Questions, Array, Math, Randomized, Algorithm_II_Day_20_Others	940	72.09
0383	Ransom Note	Easy	String, Hash_Table, Counting, Data_Structure_I_Day_6_String	333	79.58
0382	Linked List Random Node	Medium	Math, Linked_List, Randomized, Reservoir_Sampling	283	100.00
0381	Insert Delete GetRandom O(1) - Duplicates allowed	Hard	Array, Hash_Table, Math, Design, Randomized	1313	50.00
0380	Insert Delete GetRandom O(1)	Medium	Top_Interview_Questions, Array, Hash_Table, Math, Design, Randomized, Programming_Skills_II_Day_20	1326	68.23
0378	Kth Smallest Element in a Sorted Matrix	Medium	Top_Interview_Questions, Array, Sorting, Binary_Search, Matrix, Heap_Priority_Queue	522	59.78
0377	Combination Sum IV	Medium	Array, Dynamic_Programming, Dynamic_Programming_I_Day_21	217	72.41
0376	Wiggle Subsequence	Medium	Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_18	162	88.89
0375	Guess Number Higher or Lower II	Medium	Dynamic_Programming, Math, Game_Theory	235	75.00
0374	Guess Number Higher or Lower	Easy	Binary_Search, Interactive, Binary_Search_I_Day_1	134	94.19
0373	Find K Pairs with Smallest Sums	Medium	Array, Heap_Priority_Queue	1809	80.95
0372	Super Pow	Medium	Math, Divide_and_Conquer	196	100.00
0371	Sum of Two Integers	Medium	Top_Interview_Questions, Math, Bit_Manipulation, Udemy_Bit_Manipulation	129	95.45
0368	Largest Divisible Subset	Medium	Array, Dynamic_Programming, Math, Sorting	412	73.33
0367	Valid Perfect Square	Easy	Math, Binary_Search, Binary_Search_I_Day_3	137	94.55
0365	Water and Jug Problem	Medium	Math, Depth_First_Search, Breadth_First_Search, Graph_Theory_I_Day_11_Breadth_First_Search	130	100.00
0363	Max Sum of Rectangle No Larger Than K	Hard	Array, Dynamic_Programming, Binary_Search, Matrix, Ordered_Set	243	100.00
0357	Count Numbers with Unique Digits	Medium	Dynamic_Programming, Math, Backtracking	104	100.00
0355	Design Twitter	Medium	Hash_Table, Design, Heap_Priority_Queue, Linked_List	288	68.75
0354	Russian Doll Envelopes	Hard	Array, Dynamic_Programming, Sorting, Binary_Search	788	100.00
0352	Data Stream as Disjoint Intervals	Hard	Binary_Search, Design, Ordered_Set	905	75.00
0350	Intersection of Two Arrays II	Easy	Top_Interview_Questions, Array, Hash_Table, Sorting, Binary_Search, Two_Pointers, Data_Structure_I_Day_3_Array, Binary_Search_I_Day_10	321	73.37
0349	Intersection of Two Arrays	Easy	Array, Hash_Table, Sorting, Binary_Search, Two_Pointers	346	66.99
0347	Top K Frequent Elements	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Divide_and_Conquer, Quickselect, Bucket_Sort, Data_Structure_II_Day_20_Heap_Priority_Queue	268	99.74
0345	Reverse Vowels of a String	Easy	String, Two_Pointers	349	80.63
0344	Reverse String	Easy	Top_Interview_Questions, String, Two_Pointers, Recursion, Algorithm_I_Day_4_Two_Pointers, Udemy_Strings	445	69.75
0343	Integer Break	Medium	Dynamic_Programming, Math, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_21	218	63.89
0342	Power of Four	Easy	Math, Bit_Manipulation, Recursion	150	92.11
0341	Flatten Nested List Iterator	Medium	Top_Interview_Questions, Depth_First_Search, Tree, Stack, Design, Queue, Iterator, Programming_Skills_II_Day_18	210	100.00
0338	Counting Bits	Easy	Top_100_Liked_Questions, Dynamic_Programming, Bit_Manipulation, Udemy_Bit_Manipulation	186	99.26
0337	House Robber III	Medium	Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Udemy_Tree_Stack_Queue	282	84.62
0336	Palindrome Pairs	Hard	Array, String, Hash_Table, Trie	2451	67.33
0335	Self Crossing	Hard	Array, Math, Geometry	477	100.00
0334	Increasing Triplet Subsequence	Medium	Top_Interview_Questions, Array, Greedy, Data_Structure_II_Day_5_Array	672	60.61
0332	Reconstruct Itinerary	Hard	Depth_First_Search, Graph, Eulerian_Circuit	240	93.88
0331	Verify Preorder Serialization of a Binary Tree	Medium	String, Tree, Binary_Tree, Stack	335	70.00
0330	Patching Array	Hard	Array, Greedy	201	100.00
0329	Longest Increasing Path in a Matrix	Hard	Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Graph, Memoization, Topological_Sort	322	92.65
0328	Odd Even Linked List	Medium	Top_Interview_Questions, Linked_List, Level_2_Day_4_Linked_List, Udemy_Linked_List	216	86.96
0327	Count of Range Sum	Hard	Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort	638	100.00
0326	Power of Three	Easy	Top_Interview_Questions, Math, Recursion	413	76.12
0324	Wiggle Sort II	Medium	Top_Interview_Questions, Array, Sorting, Divide_and_Conquer, Quickselect	545	57.14
0322	Coin Change	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_20, Level_2_Day_12_Dynamic_Programming	332	50.68
0321	Create Maximum Number	Hard	Greedy, Stack, Monotonic_Stack	209	100.00
0319	Bulb Switcher	Medium	Math, Brainteaser	214	77.78
0318	Maximum Product of Word Lengths	Medium	Array, String, Bit_Manipulation	477	100.00
0316	Remove Duplicate Letters	Medium	String, Greedy, Stack, Monotonic_Stack	291	81.82
0315	Count of Smaller Numbers After Self	Hard	Top_Interview_Questions, Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort	1282	88.46
0313	Super Ugly Number	Medium	Array, Dynamic_Programming, Math	330	100.00
0312	Burst Balloons	Hard	Array, Dynamic_Programming	210	100.00
0310	Minimum Height Trees	Medium	Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort	521	97.56
0309	Best Time to Buy and Sell Stock with Cooldown	Medium	Array, Dynamic_Programming, Dynamic_Programming_I_Day_8	272	73.33
0307	Range Sum Query - Mutable	Medium	Array, Design, Segment_Tree, Binary_Indexed_Tree	1729	78.79
0306	Additive Number	Medium	String, Backtracking	261	63.16
0304	Range Sum Query 2D - Immutable	Medium	Array, Matrix, Design, Prefix_Sum, Dynamic_Programming_I_Day_14, Programming_Skills_II_Day_13, Udemy_2D_Arrays/Matrix	1373	85.71
0303	Range Sum Query - Immutable	Easy	Array, Design, Prefix_Sum, Programming_Skills_I_Day_12_Class_and_Object	472	63.64
0301	Remove Invalid Parentheses	Hard	String, Breadth_First_Search, Backtracking	312	100.00
0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search, Algorithm_II_Day_16_Dynamic_Programming, Binary_Search_II_Day_3, Dynamic_Programming_I_Day_18, Udemy_Dynamic_Programming	318	82.28
0299	Bulls and Cows	Medium	String, Hash_Table, Counting, Level_1_Day_13_Hashmap	254	84.82
0297	Serialize and Deserialize Binary Tree	Hard	Top_Interview_Questions, String, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design, Data_Structure_II_Day_18_Tree, Udemy_Tree_Stack_Queue	475	78.85
0295	Find Median from Data Stream	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Design, Heap_Priority_Queue, Data_Stream	2289	33.60
0292	Nim Game	Easy	Math, Game_Theory, Brainteaser	129	94.29
0290	Word Pattern	Easy	String, Hash_Table, Data_Structure_II_Day_7_String	177	89.55
0289	Game of Life	Medium	Top_Interview_Questions, Array, Matrix, Simulation	174	96.97
0287	Find the Duplicate Number	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Two_Pointers, Bit_Manipulation, Binary_Search_II_Day_5	656	66.21
0284	Peeking Iterator	Medium	Array, Design, Iterator	286	62.50
0283	Move Zeroes	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Two_Pointers, Algorithm_I_Day_3_Two_Pointers, Programming_Skills_I_Day_6_Array, Udemy_Arrays	516	79.07
0282	Expression Add Operators	Hard	String, Math, Backtracking	367	85.71
0279	Perfect Squares	Medium	Top_Interview_Questions, Dynamic_Programming, Math, Breadth_First_Search, Dynamic_Programming_I_Day_21	176	98.80
0278	First Bad Version	Easy	Binary_Search, Interactive, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_5, Level_1_Day_7_Binary_Search	349	76.86
0275	H-Index II	Medium	Array, Binary_Search, Binary_Search_II_Day_8	398	81.82
0274	H-Index	Medium	Array, Sorting, Counting_Sort	291	45.45
0273	Integer to English Words	Hard	String, Math, Recursion, Udemy_Strings	273	82.93
0268	Missing Number	Easy	Top_Interview_Questions, Array, Hash_Table, Math, Sorting, Binary_Search, Bit_Manipulation	380	83.49
0264	Ugly Number II	Medium	Hash_Table, Dynamic_Programming, Math, Heap_Priority_Queue, Dynamic_Programming_I_Day_11	182	95.45
0263	Ugly Number	Easy	Math	243	64.10
0262	Trips and Users	Hard	Database	577	63.97
0260	Single Number III	Medium	Array, Bit_Manipulation	222	100.00
0258	Add Digits	Easy	Math, Simulation, Number_Theory	234	71.64
0257	Binary Tree Paths	Easy	String, Depth_First_Search, Tree, Binary_Tree, Backtracking	320	72.84
0242	Valid Anagram	Easy	Top_Interview_Questions, String, Hash_Table, Sorting, Data_Structure_I_Day_6_String, Programming_Skills_I_Day_11_Containers_and_Libraries, Udemy_Strings	251	87.65
0241	Different Ways to Add Parentheses	Medium	String, Dynamic_Programming, Math, Recursion, Memoization	294	73.47
0240	Search a 2D Matrix II	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer, Data_Structure_II_Day_4_Array, Binary_Search_II_Day_8	460	66.08
0239	Sliding Window Maximum	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue, Udemy_Arrays	1059	86.14
0238	Product of Array Except Self	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Prefix_Sum, Data_Structure_II_Day_5_Array, Udemy_Arrays	669	48.96
0237	Delete Node in a Linked List	Easy	Top_Interview_Questions, Linked_List	183	93.00
0236	Lowest Common Ancestor of a Binary Tree	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_18_Tree, Udemy_Tree_Stack_Queue	386	45.21
0235	Lowest Common Ancestor of a Binary Search Tree	Easy	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_14_Tree, Level_1_Day_8_Binary_Search_Tree	404	75.59
0234	Palindrome Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Stack, Linked_List, Recursion, Level_2_Day_3_Linked_List, Udemy_Linked_List	641	79.53
0233	Number of Digit One	Hard	Dynamic_Programming, Math, Recursion	129	100.00
0232	Implement Queue using Stacks	Easy	Stack, Design, Queue, Data_Structure_I_Day_9_Stack_Queue, Programming_Skills_I_Day_11_Containers_and_Libraries, Level_2_Day_16_Design	258	70.86
0231	Power of Two	Easy	Math, Bit_Manipulation, Recursion, Algorithm_I_Day_13_Bit_Manipulation	161	86.81
0230	Kth Smallest Element in a BST	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_II_Day_17_Tree, Level_2_Day_9_Binary_Search_Tree	393	33.33
0229	Majority Element II	Medium	Array, Hash_Table, Sorting, Counting	408	71.21
0228	Summary Ranges	Easy	Array	169	91.89
0227	Basic Calculator II	Medium	Top_Interview_Questions, String, Math, Stack, Level_2_Day_18_Stack	383	62.50
0226	Invert Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_12_Tree, Level_2_Day_6_Tree, Udemy_Tree_Stack_Queue	233	54.90
0225	Implement Stack using Queues	Easy	Stack, Design, Queue	248	73.44
0224	Basic Calculator	Hard	String, Math, Stack, Recursion	294	93.33
0223	Rectangle Area	Medium	Math, Geometry	291	66.67
0222	Count Complete Tree Nodes
0221	Maximal Square	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16	614	44.00
0220	Contains Duplicate III	Medium	Array, Sorting, Sliding_Window, Ordered_Set, Bucket_Sort	921	72.22
0219	Contains Duplicate II	Easy	Array, Hash_Table, Sliding_Window	813	80.46
0218	The Skyline Problem	Hard	Top_Interview_Questions, Array, Heap_Priority_Queue, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Line_Sweep	365	93.14
0217	Contains Duplicate	Easy	Top_Interview_Questions, Array, Hash_Table, Sorting, Data_Structure_I_Day_1_Array, Programming_Skills_I_Day_11_Containers_and_Libraries, Udemy_Arrays	719	73.49
0216	Combination Sum III	Medium	Array, Backtracking, Udemy_Backtracking/Recursion	175	90.91
0215	Kth Largest Element in an Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect, Data_Structure_II_Day_20_Heap_Priority_Queue	839	34.43
0214	Shortest Palindrome	Hard	String, Hash_Function, String_Matching, Rolling_Hash	278	100.00
0213	House Robber II	Medium	Array, Dynamic_Programming, Algorithm_II_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_3, Udemy_Dynamic_Programming	257	59.62
0212	Word Search II	Hard	Top_Interview_Questions, Array, String, Matrix, Backtracking, Trie	268	100.00
0211	Design Add and Search Words Data Structure	Medium	String, Depth_First_Search, Design, Trie	2256	87.04
0210	Course Schedule II	Medium	Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort, Level_2_Day_11_Graph/BFS/DFS	266	96.32
0209	Minimum Size Subarray Sum	Medium	Array, Binary_Search, Prefix_Sum, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Binary_Search_II_Day_1	315	96.73
0208	Implement Trie (Prefix Tree)	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie, Level_2_Day_16_Design, Udemy_Trie_and_Heap	689	61.00
0207	Course Schedule	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort	416	40.10
0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Data_Structure_I_Day_8_Linked_List, Algorithm_I_Day_10_Recursion_Backtracking, Level_1_Day_3_Linked_List, Udemy_Linked_List	279	45.78
0205	Isomorphic Strings	Easy	String, Hash_Table, Level_1_Day_2_String	278	79.96
0204	Count Primes	Medium	Top_Interview_Questions, Array, Math, Enumeration, Number_Theory	360	96.61
0203	Remove Linked List Elements	Easy	Linked_List, Recursion, Data_Structure_I_Day_7_Linked_List	233	91.22
0202	Happy Number	Easy	Top_Interview_Questions, Hash_Table, Math, Two_Pointers, Algorithm_II_Day_21_Others, Programming_Skills_I_Day_4_Loop, Level_2_Day_1_Implementation/Simulation	261	45.08
0201	Bitwise AND of Numbers Range	Medium	Bit_Manipulation, Algorithm_II_Day_19_Bit_Manipulation	368	80.00
0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Algorithm_II_Day_6_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_1_Matrix_Related_Problems, Level_1_Day_9_Graph/BFS/DFS, Udemy_Graph	252	95.41
0199	Binary Tree Right Side View	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_16_Tree, Level_2_Day_15_Tree	194	92.89
0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_3, Level_2_Day_12_Dynamic_Programming, Udemy_Dynamic_Programming	156	92.24
0197	Rising Temperature	Easy	Database, SQL_I_Day_6_Union	394	94.15
0196	Delete Duplicate Emails	Easy	Database, SQL_I_Day_2_Select_and_Order	593	94.17
0195	Tenth Line	Easy	Shell	36	87.50
0194	Transpose File	Medium	Shell	461	33.47
0193	Valid Phone Numbers	Easy	Shell	98	88.64
0192	Word Frequency	Medium	Shell	96	80.40
0191	Number of 1 Bits	Easy	Top_Interview_Questions, Bit_Manipulation, Algorithm_I_Day_13_Bit_Manipulation, Programming_Skills_I_Day_2_Operator, Udemy_Bit_Manipulation	237	68.44
0190	Reverse Bits	Easy	Top_Interview_Questions, Bit_Manipulation, Divide_and_Conquer, Algorithm_I_Day_14_Bit_Manipulation, Udemy_Bit_Manipulation	198	81.82
0189	Rotate Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers, Algorithm_I_Day_2_Two_Pointers, Udemy_Arrays	483	86.95
0188	Best Time to Buy and Sell Stock IV	Hard	Array, Dynamic_Programming	293	68.31
0187	Repeated DNA Sequences	Medium	String, Hash_Table, Bit_Manipulation, Sliding_Window, Hash_Function, Rolling_Hash, Data_Structure_II_Day_9_String, Udemy_Strings	319	79.03
0185	Department Top Three Salaries	Hard	Database	757	87.06
0184	Department Highest Salary	Medium	Database	637	76.01
0183	Customers Who Never Order	Easy	Database, SQL_I_Day_1_Select	712	33.67
0182	Duplicate Emails	Easy	Database, SQL_I_Day_10_Where	396	68.40
0181	Employees Earning More Than Their Managers	Easy	Database	351	94.75
0180	Consecutive Numbers	Medium	Database	695	38.05
0179	Largest Number	Medium	Top_Interview_Questions, String, Sorting, Greedy	187	100.00
0178	Rank Scores	Medium	Database	292	85.14
0177	Nth Highest Salary	Medium	Database	338	86.68
0176	Second Highest Salary	Medium	Database, SQL_I_Day_4_Union_and_Select	219	92.54
0175	Combine Two Tables	Easy	Database, SQL_I_Day_5_Union	473	54.97
0174	Dungeon Game	Hard	Array, Dynamic_Programming, Matrix	300	66.67
0173	Binary Search Tree Iterator	Medium	Tree, Binary_Tree, Stack, Design, Binary_Search_Tree, Iterator, Data_Structure_II_Day_17_Tree, Programming_Skills_II_Day_16, Level_2_Day_9_Binary_Search_Tree	563	46.91
0172	Factorial Trailing Zeroes	Medium	Top_Interview_Questions, Math, Udemy_Integers	220	67.65
0171	Excel Sheet Column Number	Easy	Top_Interview_Questions, String, Math	310	30.68
0169	Majority Element	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer, Data_Structure_II_Day_1_Array, Udemy_Famous_Algorithm	460	51.25
0168	Excel Sheet Column Title	Easy	String, Math	208	66.07
0167	Two Sum II - Input Array Is Sorted	Medium	Array, Binary_Search, Two_Pointers, Algorithm_I_Day_3_Two_Pointers, Binary_Search_I_Day_7	403	68.74
0166	Fraction to Recurring Decimal	Medium	Top_Interview_Questions, String, Hash_Table, Math	147	90.91
0165	Compare Version Numbers	Medium	String, Two_Pointers	144	100.00
0164	Maximum Gap	Hard	Array, Sorting, Bucket_Sort, Radix_Sort	991	68.00
0162	Find Peak Element	Medium	Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_2_Binary_Search, Binary_Search_II_Day_12	297	53.85
0160	Intersection of Two Linked Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_II_Day_11_Linked_List, Udemy_Linked_List	262	83.50
0155	Min Stack	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Data_Structure_II_Day_14_Stack_Queue, Programming_Skills_II_Day_18, Level_2_Day_16_Design, Udemy_Design	331	84.88
0154	Find Minimum in Rotated Sorted Array II	Hard	Array, Binary_Search, Binary_Search_II_Day_13	275	84.00
0153	Find Minimum in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Array, Binary_Search, Algorithm_II_Day_2_Binary_Search, Binary_Search_I_Day_12, Udemy_Binary_Search	262	60.96
0152	Maximum Product Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Dynamic_Programming_I_Day_6, Level_2_Day_13_Dynamic_Programming, Udemy_Dynamic_Programming	253	88.42
0151	Reverse Words in a String	Medium	String, Two_Pointers, Udemy_Strings	206	98.90
0150	Evaluate Reverse Polish Notation	Medium	Top_Interview_Questions, Array, Math, Stack, Programming_Skills_II_Day_3	233	88.82
0149	Max Points on a Line	Hard	Top_Interview_Questions, Array, Hash_Table, Math, Geometry, Algorithm_II_Day_21_Others	307	83.33
0148	Sort List	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Linked_List, Divide_and_Conquer, Merge_Sort, Level_2_Day_4_Linked_List	820	61.70
0147	Insertion Sort List	Medium	Sorting, Linked_List	385	52.00
0146	LRU Cache	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Design, Linked_List, Doubly_Linked_List, Udemy_Linked_List	1116	97.93
0145	Binary Tree Postorder Traversal	Easy	Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree, Udemy_Tree_Stack_Queue	211	80.00
0144	Binary Tree Preorder Traversal	Easy	Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree, Udemy_Tree_Stack_Queue	277	37.90
0143	Reorder List	Medium	Two_Pointers, Stack, Linked_List, Recursion, Data_Structure_II_Day_13_Linked_List, Programming_Skills_II_Day_14	395	82.26
0142	Linked List Cycle II	Medium	Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_II_Day_10_Linked_List, Level_1_Day_4_Linked_List, Udemy_Linked_List	192	63.39
0141	Linked List Cycle	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_I_Day_7_Linked_List, Udemy_Linked_List	223	91.85
0140	Word Break II	Hard	Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Backtracking, Trie, Memoization	287	44.19
0139	Word Break	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization, Algorithm_II_Day_15_Dynamic_Programming, Dynamic_Programming_I_Day_9, Udemy_Dynamic_Programming	197	87.17
0138	Copy List with Random Pointer	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List, Programming_Skills_II_Day_14, Udemy_Linked_List	274	80.58
0137	Single Number II	Medium	Array, Bit_Manipulation	344	64.29
0136	Single Number	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Data_Structure_II_Day_1_Array, Algorithm_I_Day_14_Bit_Manipulation, Udemy_Integers	344	83.63
0135	Candy	Hard	Array, Greedy	466	58.33
0134	Gas Station	Medium	Top_Interview_Questions, Array, Greedy	545	70.18
0133	Clone Graph	Medium	Hash_Table, Depth_First_Search, Breadth_First_Search, Graph, Udemy_Graph	351	60.91
0132	Palindrome Partitioning II	Hard	String, Dynamic_Programming	290	100.00
0131	Palindrome Partitioning	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking	820	87.27
0130	Surrounded Regions	Medium	Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Algorithm_II_Day_8_Breadth_First_Search_Depth_First_Search	355	84.42
0129	Sum Root to Leaf Numbers	Medium	Depth_First_Search, Tree, Binary_Tree	237	52.50
0128	Longest Consecutive Sequence	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Union_Find	460	97.77
0127	Word Ladder	Hard	Top_Interview_Questions, String, Hash_Table, Breadth_First_Search, Graph_Theory_I_Day_12_Breadth_First_Search	396	98.68
0126	Word Ladder II	Hard	String, Hash_Table, Breadth_First_Search, Backtracking	418	51.45
0125	Valid Palindrome	Easy	Top_Interview_Questions, String, Two_Pointers, Udemy_Two_Pointers	353	52.06
0124	Binary Tree Maximum Path Sum	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Udemy_Tree_Stack_Queue	331	74.42
0123	Best Time to Buy and Sell Stock III	Hard	Array, Dynamic_Programming	585	95.24
0122	Best Time to Buy and Sell Stock II	Medium	Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_7, Udemy_Arrays	197	95.10
0121	Best Time to Buy and Sell Stock	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Data_Structure_I_Day_3_Array, Dynamic_Programming_I_Day_7, Level_1_Day_5_Greedy, Udemy_Arrays	609	94.06
0120	Triangle	Medium	Array, Dynamic_Programming, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_13, Udemy_Dynamic_Programming	194	97.87
0119	Pascal's Triangle II	Easy	Array, Dynamic_Programming, Data_Structure_II_Day_3_Array, Dynamic_Programming_I_Day_12, Udemy_Dynamic_Programming	157	97.27
0118	Pascal's Triangle	Easy	Top_Interview_Questions, Array, Dynamic_Programming, Data_Structure_I_Day_4_Array, Dynamic_Programming_I_Day_12, Udemy_Dynamic_Programming	277	33.22
0117	Populating Next Right Pointers in Each Node II	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List, Algorithm_II_Day_7_Breadth_First_Search_Depth_First_Search	199	94.67
0116	Populating Next Right Pointers in Each Node	Medium	Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List, Algorithm_I_Day_8_Breadth_First_Search_Depth_First_Search	355	69.02
0115	Distinct Subsequences	Hard	String, Dynamic_Programming	285	88.89
0114	Flatten Binary Tree to Linked List	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Linked_List, Udemy_Linked_List	191	93.10
0113	Path Sum II	Medium	Depth_First_Search, Tree, Binary_Tree, Backtracking, Data_Structure_II_Day_16_Tree	364	78.67
0112	Path Sum	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_12_Tree	322	36.41
0111	Minimum Depth of Binary Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Udemy_Tree_Stack_Queue	525	90.51
0110	Balanced Binary Tree	Easy	Depth_First_Search, Tree, Binary_Tree, Programming_Skills_II_Day_2, Level_2_Day_6_Tree, Udemy_Tree_Stack_Queue	310	63.63
0109	Convert Sorted List to Binary Search Tree	Medium	Tree, Binary_Tree, Linked_List, Binary_Search_Tree, Divide_and_Conquer	376	59.26
0108	Convert Sorted Array to Binary Search Tree	Easy	Top_Interview_Questions, Array, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer, Data_Structure_II_Day_15_Tree, Level_2_Day_9_Binary_Search_Tree, Udemy_Tree_Stack_Queue	334	35.39
0107	Binary Tree Level Order Traversal II	Medium	Breadth_First_Search, Tree, Binary_Tree	204	98.04
0106	Construct Binary Tree from Inorder and Postorder Traversal	Medium	Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer	358	61.29
0105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer, Data_Structure_II_Day_15_Tree	370	58.31
0104	Maximum Depth of Binary Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree, Programming_Skills_I_Day_10_Linked_List_and_Tree, Udemy_Tree_Stack_Queue	236	83.39
0103	Binary Tree Zigzag Level Order Traversal	Medium	Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_15_Tree, Udemy_Tree_Stack_Queue	316	34.25
0102	Binary Tree Level Order Traversal	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree, Level_1_Day_6_Tree, Udemy_Tree_Stack_Queue	332	67.53
0101	Symmetric Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree, Level_2_Day_15_Tree	190	91.36
0100	Same Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Level_2_Day_15_Tree, Udemy_Tree_Stack_Queue	208	72.24
0099	Recover Binary Search Tree	Medium	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	492	39.39
0098	Validate Binary Search Tree	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_14_Tree, Level_1_Day_8_Binary_Search_Tree, Udemy_Tree_Stack_Queue	330	41.38
0097	Interleaving String	Medium	String, Dynamic_Programming	240	57.50
0096	Unique Binary Search Trees	Medium	Top_100_Liked_Questions, Dynamic_Programming, Math, Tree, Binary_Tree, Binary_Search_Tree, Dynamic_Programming_I_Day_11	147	88.52
0095	Unique Binary Search Trees II	Medium	Dynamic_Programming, Tree, Binary_Tree, Backtracking, Binary_Search_Tree	360	41.38
0094	Binary Tree Inorder Traversal	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree, Udemy_Tree_Stack_Queue	269	38.80
0093	Restore IP Addresses	Medium	String, Backtracking	304	73.33
0092	Reverse Linked List II	Medium	Linked_List	191	82.35
0091	Decode Ways	Medium	Top_Interview_Questions, String, Dynamic_Programming, Algorithm_II_Day_15_Dynamic_Programming, Dynamic_Programming_I_Day_10	237	76.88
0090	Subsets II	Medium	Array, Bit_Manipulation, Backtracking, Algorithm_II_Day_9_Recursion_Backtracking	366	58.09
0089	Gray Code	Medium	Math, Bit_Manipulation, Backtracking	273	100.00
0088	Merge Sorted Array	Easy	Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_I_Day_2_Array	311	33.40
0087	Scramble String	Hard	String, Dynamic_Programming	366	85.00
0086	Partition List	Medium	Two_Pointers, Linked_List	172	94.00
0085	Maximal Rectangle	Hard	Array, Dynamic_Programming, Matrix, Stack, Monotonic_Stack	463	55.17
0084	Largest Rectangle in Histogram	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Stack, Monotonic_Stack	525	100.00
0083	Remove Duplicates from Sorted List	Easy	Linked_List, Data_Structure_I_Day_8_Linked_List	274	77.82
0082	Remove Duplicates from Sorted List II	Medium	Two_Pointers, Linked_List, Data_Structure_II_Day_11_Linked_List, Algorithm_II_Day_3_Two_Pointers	241	91.04
0081	Search in Rotated Sorted Array II	Medium	Array, Binary_Search, Binary_Search_II_Day_12	352	42.31
0080	Remove Duplicates from Sorted Array II	Medium	Array, Two_Pointers, Udemy_Arrays	357	44.78
0079	Word Search	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking	463	68.49
0078	Subsets	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Algorithm_II_Day_9_Recursion_Backtracking, Udemy_Backtracking/Recursion	191	97.44
0077	Combinations	Medium	Backtracking, Algorithm_I_Day_11_Recursion_Backtracking	244	100.00
0076	Minimum Window Substring	Hard	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Level_2_Day_14_Sliding_Window/Two_Pointer	346	85.20
0075	Sort Colors	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_2_Array, Udemy_Arrays	198	85.66
0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Data_Structure_I_Day_5_Array, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_8, Level_2_Day_8_Binary_Search, Udemy_2D_Arrays/Matrix	290	40.17
0073	Set Matrix Zeroes	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix, Udemy_2D_Arrays/Matrix	255	100.00
0072	Edit Distance	Hard	Top_100_Liked_Questions, String, Dynamic_Programming, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_19, Udemy_Dynamic_Programming	320	63.53
0071	Simplify Path	Medium	String, Stack	318	64.44
0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_2, Level_1_Day_10_Dynamic_Programming, Udemy_Dynamic_Programming	127	97.06
0069	Sqrt(x)	Easy	Top_Interview_Questions, Math, Binary_Search, Binary_Search_I_Day_4	153	95.75
0068	Text Justification	Hard	Array, String, Simulation	269	50.00
0067	Add Binary	Easy	String, Math, Bit_Manipulation, Simulation, Programming_Skills_II_Day_5	327	32.67
0066	Plus One	Easy	Top_Interview_Questions, Array, Math, Programming_Skills_II_Day_3, Udemy_Arrays	303	35.18
0065	Valid Number	Hard	String	310	81.82
0064	Minimum Path Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16, Udemy_Dynamic_Programming	222	95.70
0063	Unique Paths II	Medium	Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_15	187	84.62
0062	Unique Paths	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Algorithm_II_Day_13_Dynamic_Programming, Dynamic_Programming_I_Day_15, Level_1_Day_11_Dynamic_Programming	209	49.18
0061	Rotate List	Medium	Two_Pointers, Linked_List, Programming_Skills_II_Day_16, Udemy_Linked_List	193	92.16
0060	Permutation Sequence	Hard	Math, Recursion	146	100.00
0059	Spiral Matrix II	Medium	Array, Matrix, Simulation, Data_Structure_II_Day_3_Array	153	100.00
0058	Length of Last Word	Easy	String, Programming_Skills_II_Day_6, Udemy_Arrays	243	63.33
0057	Insert Interval	Medium	Array, Level_2_Day_17_Interval	257	99.52
0056	Merge Intervals	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Data_Structure_II_Day_2_Array, Level_2_Day_17_Interval, Udemy_2D_Arrays/Matrix	320	94.22
0055	Jump Game	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_4, Udemy_Arrays	670	66.67
0054	Spiral Matrix	Medium	Top_Interview_Questions, Array, Matrix, Simulation, Programming_Skills_II_Day_8, Level_2_Day_1_Implementation/Simulation, Udemy_2D_Arrays/Matrix	224	62.50
0053	Maximum Subarray	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Data_Structure_I_Day_1_Array, Dynamic_Programming_I_Day_5, Udemy_Famous_Algorithm	662	82.48
0052	N-Queens II	Hard	Backtracking	231	80.00
0051	N-Queens	Hard	Top_100_Liked_Questions, Array, Backtracking	243	95.10
0050	Pow(x, n)	Medium	Top_Interview_Questions, Math, Recursion, Udemy_Integers	264	52.98
0049	Group Anagrams	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Data_Structure_II_Day_8_String, Programming_Skills_II_Day_11, Udemy_Strings	506	86.55
0048	Rotate Image	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Data_Structure_II_Day_3_Array, Programming_Skills_II_Day_7, Udemy_2D_Arrays/Matrix	287	46.50
0047	Permutations II	Medium	Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking	406	76.36
0046	Permutations	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Algorithm_I_Day_11_Recursion_Backtracking, Level_2_Day_20_Brute_Force/Backtracking, Udemy_Backtracking/Recursion	186	100.00
0045	Jump Game II	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_13_Dynamic_Programming, Dynamic_Programming_I_Day_4	227	98.14
0044	Wildcard Matching	Hard	Top_Interview_Questions, String, Dynamic_Programming, Greedy, Recursion, Udemy_Dynamic_Programming	401	86.11
0043	Multiply Strings	Medium	String, Math, Simulation, Data_Structure_II_Day_8_String, Programming_Skills_II_Day_4, Level_2_Day_2_String	390	56.25
0042	Trapping Rain Water	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack, Dynamic_Programming_I_Day_9, Udemy_Two_Pointers	196	100.00
0041	First Missing Positive	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Udemy_Arrays	345	100.00
0040	Combination Sum II	Medium	Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking	348	80.92
0039	Combination Sum	Medium	Top_100_Liked_Questions, Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking, Level_2_Day_20_Brute_Force/Backtracking, Udemy_Backtracking/Recursion	317	86.85
0038	Count and Say	Medium	Top_Interview_Questions, String	317	41.11
0037	Sudoku Solver	Hard	Array, Matrix, Backtracking	294	79.69
0036	Valid Sudoku	Medium	Top_Interview_Questions, Array, Hash_Table, Matrix, Data_Structure_I_Day_5_Array	346	65.03
0035	Search Insert Position	Easy	Top_100_Liked_Questions, Array, Binary_Search, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_2	267	50.32
0034	Find First and Last Position of Element in Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_5	228	83.38
0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_11, Level_2_Day_8_Binary_Search, Udemy_Binary_Search	184	86.08
0032	Longest Valid Parentheses	Hard	Top_100_Liked_Questions, String, Dynamic_Programming, Stack	215	95.71
0031	Next Permutation	Medium	Top_100_Liked_Questions, Array, Two_Pointers	211	94.23
0030	Substring with Concatenation of All Words	Hard	String, Hash_Table, Sliding_Window	441	85.84
0029	Divide Two Integers	Medium	Top_Interview_Questions, Math, Bit_Manipulation, Udemy_Bit_Manipulation	281	31.67
0028	Find the Index of the First Occurrence in a String	Easy	Top_Interview_Questions, String, Two_Pointers, String_Matching, Programming_Skills_II_Day_1	257	32.35
0027	Remove Element	Easy	Array, Two_Pointers	293	32.19
0026	Remove Duplicates from Sorted Array	Easy	Top_Interview_Questions, Array, Two_Pointers, Udemy_Two_Pointers	361	77.19
0025	Reverse Nodes in k-Group	Hard	Top_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_13_Linked_List, Udemy_Linked_List	194	87.72
0024	Swap Nodes in Pairs	Medium	Top_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_12_Linked_List, Udemy_Linked_List	149	99.39
0023	Merge k Sorted Lists	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Heap_Priority_Queue, Linked_List, Divide_and_Conquer, Merge_Sort	323	75.14
0022	Generate Parentheses	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Udemy_Backtracking/Recursion	210	78.51
0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Data_Structure_I_Day_7_Linked_List, Algorithm_I_Day_10_Recursion_Backtracking, Level_1_Day_3_Linked_List, Udemy_Linked_List	176	96.25
0020	Valid Parentheses	Easy	Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Data_Structure_I_Day_9_Stack_Queue, Udemy_Strings	226	72.53
0019	Remove Nth Node From End of List	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Algorithm_I_Day_5_Two_Pointers, Level_2_Day_3_Linked_List	180	91.58
0018	4Sum	Medium	Array, Sorting, Two_Pointers	221	100.00
0017	Letter Combinations of a Phone Number	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Udemy_Backtracking/Recursion	262	73.59
0016	3Sum Closest	Medium	Array, Sorting, Two_Pointers, Level_2_Day_14_Sliding_Window/Two_Pointer	413	95.05
0015	3Sum	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_1_Array, Algorithm_II_Day_3_Two_Pointers, Udemy_Two_Pointers	761	90.55
0014	Longest Common Prefix	Easy	Top_Interview_Questions, String, Level_2_Day_2_String, Udemy_Strings	209	88.86
0013	Roman to Integer	Easy	Top_Interview_Questions, String, Hash_Table, Math	358	75.16
0012	Integer to Roman	Medium	String, Hash_Table, Math	223	93.87
0011	Container With Most Water	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers, Algorithm_II_Day_4_Two_Pointers	474	89.18
0010	Regular Expression Matching	Hard	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Recursion, Udemy_Dynamic_Programming	292	58.58
0009	Palindrome Number	Easy	Math, Udemy_Integers	238	96.24
0008	String to Integer (atoi)	Medium	Top_Interview_Questions, String	196	96.46
0007	Reverse Integer	Medium	Top_Interview_Questions, Math, Udemy_Integers	245	60.32
0006	Zigzag Conversion	Medium	String	366	80.62
0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Data_Structure_II_Day_9_String, Algorithm_II_Day_14_Dynamic_Programming, Dynamic_Programming_I_Day_17, Udemy_Strings	323	75.48
0004	Median of Two Sorted Arrays	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Divide_and_Conquer	355	83.48
0003	Longest Substring Without Repeating Characters	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Algorithm_I_Day_6_Sliding_Window, Level_2_Day_14_Sliding_Window/Two_Pointer, Udemy_Strings	258	91.09
0002	Add Two Numbers	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Data_Structure_II_Day_10_Linked_List, Programming_Skills_II_Day_15	417	50.44
0001	Two Sum	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Data_Structure_I_Day_2_Array, Level_1_Day_13_Hashmap, Udemy_Arrays	234	92.75

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