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
public class Solution { public int titleToNumber(String s) { char[] ch_list=s.toCharArray(); int size=ch_list.length; int sum=0; for(int i=0;i<size;i++){ int num=ch_list[i]-‘A‘+1; sum=sum+(int)Math.pow(26,size-i-1)*num; } return sum; } }
原文：http://www.cnblogs.com/mrpod2g/p/4236780.html