LeetCode OJ：Excel Sheet Column Number（表格列数）

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 

比较简单，类似进制的转换，代码如下：

 class Solution {
 public:
     int titleToNumber(string s) {
         int result = ;
         for(int i = ; i < s.size(); ++i){
             result = result *  + s[i] - 'A' + ;
         }
         return result;
     }
 };