leetcode-66-plus one

class Solution {
public:
    vector<int> plusOne(vector<int>& digits) {
        vector<int> res;
        int x = 1;
        while(digits.size()!=0){
        	int y = digits.back();
        	digits.pop_back();
        	x = x + y;
        	res.insert(res.begin(), x % 10);
        	x = x /10;
        }
        if(x != 0)
        	res.insert(res.begin(), x);
        return res;
    }
};