LeetCode 171 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 

AC代码如下：

class Solution {public://显然这是26进制    int titleToNumber(string s) {        int length=s.size();        int ret=0;        for(int i=0;i<length;++i){            ret=ret*26+(s[i]-'A'+1);        }        return ret;    }};