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/**

* Given a number represented as an array of digits, plus one to the number.

*/

public class PlusOne {

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

int length = digits.length;

int add = 1;

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

int sum = digits[i] + add;

digits[i] = sum % 10;

add = sum / 10;

if (add == 0)

return digits;

}

int[] ret = new int[length + 1];

ret[0] = add;

for (int i = 0; i < length; i++) {

ret[i + 1] = digits[i];

}

return ret;

}

}