66. Plus One

Given a non-negative integer represented as anon-emptyarray of digits, plus one to the integer.

You may assume the integer do not contain any leading zero, except the number 0 itself.

The digits are stored such that the most significant digit is at the head of the list.

思路：加一简单

public class Solution {
    public int[] plusOne(int[] digits) {
        for (int i=digits.length-1;i>=0;i--){
            if (digits[i]!=9){
                digits[i]++;
                break;
            }else{
                digits[i] = 0;
            }

        }
        if (digits[0]==0){
            int[] res = new int[digits.length+1];
            res[0] = 1;
            return res;
        }
        return digits;
    }
}