leetcode 171. Excel Sheet Column Number

题目内容
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 -> 1B -> 2C -> 3...Z -> 26AA -> 27AB -> 28 

题目分析

可以将这道题理解为一个数值转换，转换成26进制的数字转换问题就可以了。

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