LeetCode：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 

// Source : https://oj.leetcode.com/problems/excel-sheet-column-number/// Author : Chao Zeng// Date   : 2014-12-29class Solution {public:    int titleToNumber(string s) {        int n = s.length();        int ans = 0;;        for (int i = 0; i < n; i++){            int temp =(s[i] - 'A' + 1)*pow(26,n - i -1);            ans += temp;        }        return ans;    }};