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 }
LeetCode Excel Sheet Column Number
原文：http://www.cnblogs.com/birdhack/p/4192514.html