Related to question

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

Credits:

Special thanks to for adding this problem and creating all test cases.

 

这题实际上相当于一种二十六进制转十进制的问题，并不难，只要一位一位的转换即可。代码如下：

 

class Solution {public:    int titleToNumber(string s) {        int n = s.size();        int res = 0;        int tmp = 1;        for (int i = n; i >= 1; --i) {            res += (s[i - 1] - 'A' + 1) * tmp;             tmp *= 26;        }        return res;    }};