[LeetCode] 171.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 = 0;
        int tmp = 1;
        for (int i = n; i >= 1; --i) {
            res += (s[i - 1] - 'A' + 1) * tmp; 
            tmp *= 26;
        }
        return res;
    }
};

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