[LeetCode] Excel Sheet Column Number 求Excel表列序号

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 

Credits:
Special thanks to @ts 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 = ;
        int tmp = ;
        for (int i = n; i >= ; --i) {
            res += (s[i - ] - 'A' + ) * tmp;
            tmp *= ;
        }
        return res;
    }
};

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