LeetCode 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 

 1 public class Solution {
 2     public int titleToNumber(String s) {
 3         if (s == null || s.equals("")) {
 4             return 0;
 5         }
 6         int ret=0;
 7         while (s.length() > 0) {
 8             int y=s.length()-1;
 9             int first=s.charAt(0)-'A'+1;
10             ret = (int) (ret + first * Math.pow(26, y));
11             s = s.substring(1);
12         }
13         return ret;
14     }
15 }

 

posted @ 2014-12-29 22:11  birdhack  阅读(154)  评论(0)  编辑  收藏  举报