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.

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注意进位，从vector末尾扫向开头。

class Solution {
public:
    vector<int> plusOne(vector<int> &digits) {
        if(digits.size() == 0) return digits;
        (*(digits.end() - 1))++;
        for(int i = digits.size() - 1; i > 0; i--){
            if(digits[i] == 10){
                digits[i] = 0;
                digits[i - 1]++;
            }
            else{
                break;
            }
        }
        if(digits[0] == 10){
            digits[0] = 0;
            digits.insert(digits.begin(), 1);
        }
        return digits;
    }
};