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
int titleToNumber(char* s) { int result=0; int i=0; while(i<strlen(s)) { result=result*26+(s[i]-‘A‘+1); i++; } return result; }
LeetCode171:Excel Sheet Column Number
原文：http://www.cnblogs.com/evansyang/p/5244361.html