Plus One

class Solution {
public:
vector<int> plusOne(vector<int> &digits)
{
    int n = digits.size();
    for (int i = n - 1; i >= 0; --i)
    {
        if (digits[i] == 9)
        {
            digits[i] = 0;
        }
        else
        {
            digits[i]++;
            return digits;
        }
    }
        digits[0] =1;
        digits.push_back(0);
        return digits;

}
};

REF:

• https://discuss.leetcode.com/topic/4556/is-it-a-simple-code-c