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

这道题很简单，就是一个26进制的问题，用pow（26,i）就解决了，还有一个就是字符转数字的问题，因为昨天做valid palindrom的时候，用到了ASCii码的转换，所以在这边用起来也是非常得心应手，就是s-'A'+1就可以将A转成1，B转成2了~~

刚开始写完，一直出错，cout了中间结果以后发现，字符串读取顺序出错了，就例如AB吧，A是先读取的所以是0，B是1；而我想当然以为A是1，B是0;所以乘方那里就不对了~换了以后就好了。Easy程度的题做起来就是high~(*^__^*) 嘻嘻……

#include<iostream>
using namespace std;
class Solution {
public:int titleToNumber(string s) {int len=s.length();if(len==0) return 0;int temp,temp1=0,num=0;for(int i=len-1;i>=0;i--){if(s[i]>='A'&&s[i]<='Z'){temp=s[i]-'A'+1;temp1=(pow(26,len-i-1))*temp;}num+=temp1;}return num;}
};

转载于:https://www.cnblogs.com/LUO77/p/4934658.html

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