- https://leetcode.com/problems/length-of-last-word/
- https://leetcode.com/problems/fizz-buzz/description/
- https://leetcode.com/problems/binary-search/
- XOR: https://leetcode.com/problems/single-number/description/
- https://leetcode.com/problems/count-subarrays-of-length-three-with-a-condition/description/?envType=daily-question&envId=2025-04-27
- https://leetcode.com/problems/palindrome-number/description/
- Log(n^2) https://leetcode.com/problems/two-sum/description/
- HashMap: https://leetcode.com/problems/two-sum/description/
- Two Pointers: https://leetcode.com/problems/move-zeroes/description/
- One Pointer: https://leetcode.com/problems/best-time-to-buy-and-sell-stock/description/
- https://leetcode.com/problems/ransom-note/
- https://leetcode.com/problems/contains-duplicate/
- https://leetcode.com/problems/contains-duplicate-ii/description/
- https://leetcode.com/problems/find-all-numbers-disappeared-in-an-array/description/
- https://leetcode.com/problems/three-consecutive-odds/description/?envType=daily-question&envId=2025-05-11
- String Problem: https://leetcode.com/problems/is-subsequence/description/
- https://leetcode.com/problems/remove-duplicates-from-sorted-array/description/
- https://leetcode.com/problems/valid-palindrome/
- https://leetcode.com/problems/merge-sorted-array/
- https://leetcode.com/problems/valid-parentheses/description/
- https://leetcode.com/problems/search-in-rotated-sorted-array/description/
- https://leetcode.com/problems/find-minimum-in-rotated-sorted-array/description/
- Factorial Trailing Zeroes: https://leetcode.com/problems/factorial-trailing-zeroes/submissions/
- https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/
- https://leetcode.com/problems/rotate-array/description/
- https://leetcode.com/problems/jump-game/description/
- https://leetcode.com/problems/product-of-array-except-self/
- Hash Table: https://leetcode.com/problems/sequential-digits/description/
- Hash Table: https://leetcode.com/problems/find-all-duplicates-in-an-array/
- https://leetcode.com/problems/minimum-equal-sum-of-two-arrays-after-replacing-zeros/description/?envType=daily-question&envId=2025-05-10
- Bad Question : I don't recommend to solve: https://leetcode.com/problems/next-permutation/description/
- https://leetcode.com/problems/subarray-product-less-than-k/description/
- https://leetcode.com/problems/k-diff-pairs-in-an-array/description/
- Two Pointers: with new idea: https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/description/
- https://leetcode.com/problems/sort-colors/description/
- Medium but Very Hard: https://leetcode.com/problems/3sum/
- https://leetcode.com/problems/asteroid-collision/
- https://leetcode.com/problems/decode-string/
- https://leetcode.com/problems/first-missing-positive/description/
- Very Hard with idea: https://leetcode.com/problems/longest-valid-parentheses/description/
- XOR
- Binary Search
- Rotated Sorted Array
- Palindrome Number
- Factorial
- Hash Map (DS)
- 2 Pointers (Two Pointers)
- left and right pointers
- Sliding window
- Prefix sum &&& Suffix sum
- Prefix product &&& Suffix product
- Hash Table (DS)
- Mark Indices --> By negative value
- Sliding Window
- Stack (DS)
- Greedy Algorithm
-
Map In Dart (Hash Map ---- Linked Hash Map ---- Splay Tree Map)
-
Hash Map (Not Ordered) -- Hash Table (Ordered)
-
Hash Table
A Hash table is defined as a data structure used to insert, look up, and remove key-value pairs quickly. It operates on the hashing concept, where each key is translated by a hash function into a distinct index in an array. The index functions as a storage location for the matching value. In simple words, it maps the keys with the value.
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Find Sum of 2 Numbers in sorted List
- Brute Force (Bad)
- Two Pointers