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 

这道题非常之简单，比起原题来简单不少，非常直接，就是一个进制的问题。代码奉上

class Solution {public:    int titleToNumber(string s) {        if (s == "")            return 0;        int result = 0;        int i = 0;        while (s[i] != ‘\0‘)        {            result = result * 26 + (s[i]-‘A‘+1);            i++;        }        return result;    }};

 习惯了字符串为空用s=="",实际上用s.empty()更为规范和合适一些。

HappyLeetcode38: Excel Sheet Column Number