1742. 盒子中小球的最大数量

1742. 盒子中小球的最大数量

class Solution {
    public int countBalls(int l, int r) {
        int[] box = new int[50];
        int max = 0;
        for (int i = l; i <= r; i++) {
            int num = getNum(i);
            box[num]++;
            max = Math.max(box[num], max);
        }
        return max;
    }

    int getNum(int n) {
        int res = 0;
        while (n > 0) {
            res += n % 10;
            n /= 10;
        }
        return res;
    }
}