Reverse Degree of a String — C++

// Time:  O(n)
// Space: O(1)

// string
class Solution {
public:
    int reverseDegree(string s) {
        int result = 0;
        for (int i = 0; i < size(s); ++i) {
            result += (i + 1) * (26 - (s[i] - 'a'));
        }
        return result;
    }
};