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    public int[] plusOne(int[] digits) {
        int n = digits.length;
        int carrier = 1;
        for (int i = n - 1; i >= 0; i--) {
            int tmp = digits[i] + carrier;
            digits[i] = tmp % 10;
            carrier = tmp / 10;
        }
        if (carrier == 0)
            return digits;
        int[] result = new int[n + 1];
        result[0] = carrier;
        System.arraycopy(digits, 0, result, 1, n);
        return result;
    }

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