LeetCode_ 66 (plus one)

Title Description ：
Given a by Integers Composed of Non empty The nonnegative integer represented by an array , Add one to the number .

The highest digit is placed at the top of the array , Each element in the array stores only a single number .

You can assume that except for integers 0 outside , This integer will not start with zero .

Example 1：
Input ：digits = [1,2,3]
Output ：[1,2,4]
explain ： Input array represents number 123.

Example 2：
Input ：digits = [4,3,2,1]
Output ：[4,3,2,2]
explain ： Input array represents number 4321.

Example 3：
Input ：digits = [0]
Output ：[1]

Tips ：
1 <= digits.length <= 100
0 <= digits[i] <= 9

class Solution {
    
    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;
    }
}