[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 -> 1B -> 2C -> 3…Z -> 26AA -> 27AB -> 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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