Решение

class Solution {
    fun countBalls(lowLimit: Int, highLimit: Int): Int {
        val count = IntArray(46)
        var maxCount = 0
        for (i in lowLimit..highLimit) {
            var x = i
            var s = 0
            while (x > 0) {
                s += x % 10
                x /= 10
            }
            count[s]++
            if (count[s] > maxCount) maxCount = count[s]
        }
        return maxCount
    }
}