LeetCode in Kotlin

3280. Convert Date to Binary

Easy

You are given a string date representing a Gregorian calendar date in the yyyy-mm-dd format.

date can be written in its binary representation obtained by converting year, month, and day to their binary representations without any leading zeroes and writing them down in year-month-day format.

Return the binary representation of date.

Example 1:

Input: date = “2080-02-29”

Output: “100000100000-10-11101”

Explanation:

100000100000, 10, and 11101 are the binary representations of 2080, 02, and 29 respectively.

Example 2:

Input: date = “1900-01-01”

Output: “11101101100-1-1”

Explanation:

11101101100, 1, and 1 are the binary representations of 1900, 1, and 1 respectively.

Constraints:

• date.length == 10
• date[4] == date[7] == '-', and all other date[i]’s are digits.
• The input is generated such that date represents a valid Gregorian calendar date between Jan 1^st, 1900 and Dec 31^st, 2100 (both inclusive).

Solution

class Solution {
    fun convertDateToBinary(dat: String): String {
        val str = StringBuilder()
        val res = StringBuilder()
        for (c in dat.toCharArray()) {
            if (c.isDigit()) {
                str.append(c)
            } else if (c == '-') {
                res.append(str.toString().toInt().toString(2))
                res.append('-')
                str.setLength(0)
            }
        }
        if (str.isNotEmpty()) {
            res.append(str.toString().toInt().toString(2))
        }
        return res.toString()
    }
}

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