171. Excel Sheet Column Number

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 

Credits:
Special thanks to @ts for adding this problem and creating all test cases.

1 public class Solution {
2     public int titleToNumber(String s) {
3         int result = 0;
4         for(int i = 0;i<s.length();i++){
5             result = result*26 + s.charAt(i) - ‘A‘ + 1;
6         }
7         return result;
8     }
9 }

171. Excel Sheet Column Number

原文：http://www.cnblogs.com/guoguolan/p/5386593.html