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 
public class Solution {    public int titleToNumber(String s) {int sum = 0;        for(int i=0;i<s.length();i++){        sum = 26*sum+(s.charAt(i)-'A'+1);        }        return sum;    }}