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 int number = 0; 5 int tmp = 0; 6 for (int i = 0; i < s.length();i++){ 7 tmp = s[i] - ‘A‘ + 1; 8 number = number * 26 + tmp; 9 } 10 return number; 11 12 } 13 };
Leetcode Excel Sheet Column Number
原文：http://www.cnblogs.com/fyymonica/p/4226358.html