【leetcode】【171】Excel Sheet Column Number

一、问题描述

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

二、问题分析

非常简单，直接上代码。

三、Java AC代码

public int titleToNumber(String s) {
int len = s.length();
int res = 0;
for(int i=0;i<len;i++){
res = res * 26 + s.charAt(i)-64;
}
return res;
}