LeetCode in Kotlin

1154. Day of the Year

Easy

Given a string date representing a Gregorian calendar date formatted as YYYY-MM-DD, return the day number of the year.

Example 1:

Input: date = “2019-01-09”

Output: 9

Explanation: Given date is the 9th day of the year in 2019.

Example 2:

Input: date = “2019-02-10”

Output: 41

Constraints:

• date.length == 10
• date[4] == date[7] == '-', and all other date[i]’s are digits
• date represents a calendar date between Jan 1^st, 1900 and Dec 31^th, 2019.

Solution

class Solution {
    fun dayOfYear(date: String): Int {
        val monthDays = intArrayOf(0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)
        val dateArr = date.split("-".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
        val year = dateArr[0].toInt()
        val month = dateArr[1].toInt()
        val day = dateArr[2].toInt()
        var dayCount = 0
        val leapYear = year % 4 == 0 && year % 100 != 0 || year % 400 == 0
        for (i in 1 until month) {
            dayCount += monthDays[i]
        }
        dayCount += day
        if (leapYear && month > 2) {
            dayCount++
        }
        return dayCount
    }
}

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