171. Excel Sheet Column Number

题目：

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

链接： http://leetcode.com/problems/excel-sheet-column-number/

2/20/2017, Java

 1 public class Solution {
 2     public int titleToNumber(String s) {
 3         int value = 0;
 4         char c;
 5         for (int i = 0; i < s.length(); i++) {
 6             c = s.charAt(i);
 7             value = value * 26 + (c - 'A' + 1);
 8         }
 9         return value;
10     }
11 }