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
1 class Solution { 2 public: 3 int titleToNumber(string s) { 4 auto it = s.end()-1; 5 char c; 6 int num =0; 7 int i=1; 8 while(it>=s.begin()) { 9 c = *it; 10 num += (c-‘A‘+1)*i; 11 i *= 26; 12 --it; 13 } 14 return num; 15 } 16 };
模仿整数的操作即可。
原文：http://www.cnblogs.com/ittinybird/p/4433705.html