leetcode 171 Excel Sheet Column Number

Related to question Excel Sheet Column Title

Given a column title as appear in an Excel sheet, return its corresponding column number.

For example:

    A -> 1    B -> 2    C -> 3    ...    Z -> 26    AA -> 27    AB -> 28 

Credits:
Special thanks to @ts for adding this problem and creating all test cases.

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class Solution {public:int titleToNumber(string s) {int res = 0;for(int i=0; i < s.length(); i++) {res = 26*res + (s[i]-'A'+1);}return res;}}