66. plus one

class Solution {
public:
    vector<int> plusOne(vector<int>& digits) {
        vector<int> num;

        int plus = 1;
        for (int i = digits.size() - 1; i >= 0; i--) {
            if (digits[i] + plus == 10) {
                num.push_back(0);
                plus = 1;
            } else {
                num.push_back(digits[i] + plus);
                plus = 0;
            }
        }
        
        if (plus == 1)
            num.push_back(plus);
        reverse(num.begin(),num.end());
        return num;
    }
};