【leetcode】Plus One

Given a non-negative number represented as an array of digits, plus one to the number.

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

 

class Solution {
public:
    vector<int> plusOne(vector<int> &digits) {
        // Start typing your C/C++ solution below
        // DO NOT write int main() function
        vector<int> ret(digits);
        reverse(ret.begin(), ret.end());
        
        int flag = 1;
        for(int i = 0; i < ret.size(); i++)
        {
            ret[i] += flag;
            flag = ret[i] / 10;
            ret[i] %= 10; 
        }
        
        if (flag == 1)
            ret.push_back(1);
        
        reverse(ret.begin(), ret.end());
        
        return ret;
    }
};