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public class PlusOne {

public int[] plusOne(int[] digits) {

for (int i = digits.length - 1; i >= 0; i--) {

if (digits[i] < 9) {

digits[i]++;

return digits;

}

digits[i] = 0;

}

int[] res = new int[digits.length + 1];

res[0] = 1;

return res;

}

}