[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.

168. Excel Sheet Column Title 的类似题目，这次是给出列的题目，返回对应的数字。

Python：

class Solution(object):
    def titleToNumber(self, s):
        result = 0
        for i in xrange(len(s)):
            result *= 26
            result += ord(s[i]) - ord('A') + 1
        return result

C++：

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;
    }
};

　

类似题目：

[LeetCode] 168. Excel Sheet Column Title 求Excel表列名称

　

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