LeetCode:Excel Sheet Column Number

712 단어 MathLeetCode
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   : 2014-12-29

class 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;
    }
};

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