LeetCode in Kotlin

1556. Thousand Separator

Easy

Given an integer n, add a dot (“.”) as the thousands separator and return it in string format.

Example 1:

Input: n = 987

Output: “987”

Example 2:

Input: n = 1234

Output: “1.234”

Constraints:

• 0 <= n <= 231 - 1

Solution

class Solution {
    fun thousandSeparator(n: Int): String {
        val str = n.toString()
        val sb = StringBuilder()
        var i = str.length - 1
        var j = 1
        while (i >= 0) {
            sb.append(str[i])
            j++
            if (j % 3 == 0) {
                sb.append(".")
            }
            i--
            j++
        }
        var result = sb.reverse().toString()
        if (result[0] == '.') {
            result = result.substring(1)
        }
        return result
    }
}

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