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：

 1 class Solution {
 2 public:
 3     int titleToNumber(string s) {
 4         int result = 0;
 5         for(int i = 0; i < s.size(); ++i){
 6             result = result * 26 + s[i] - \'A\' + 1;
 7         }
 8         return result;
 9     }
10 };