Related to question Excel Sheet Column TitleGiven 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         int res = 0; 4         for (int i=0; i<s.length(); i++) { 5             char c = s.charAt(i); 6             res += (int)(c - ‘A‘ + 1) * Math.pow(26, s.length()-i-1); 7         } 8         return res; 9     }10 }