Leetcode 题目解析之 Plus One

    public int[] plusOne(int[] digits) {
        if (digits == null || digits.length == 0) {
            return null;
        }
        int[] rt = new int[digits.length + 1];
        digits[digits.length - 1]++;
        for (int i = digits.length - 1; i >= 0; i--) {
            rt[i + 1] += digits[i];
            rt[i] += rt[i + 1] / 10;
            rt[i + 1] %= 10;
        }
        if (rt[0] == 0) {
            return Arrays.copyOfRange(rt, 1, rt.length);
        } else {
            return rt;
        }
    }