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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
相当于26进制，拿十进制做类比就可以了，相当于如何把字符串"1234"转整数1234
class Solution { public: int titleToNumber(string s) { int res = 0; int size = s.size(); for(int i=0;i<size;i++){ int n = size - i -1; int digit = (s[i]-‘A‘+1); res += digit * pow(26,n); } return res; } };
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原文地址：http://www.cnblogs.com/zengzy/p/5057595.html
