PAT乙级1029 旧键盘 (20 分)

Posted 2021-08-04 辉小歌

题目地址

#include<cstdio>
#include<iostream>
#include<string>
#include<map>
using namespace std;
int main(void)
{
	string s1,s2;
	map<char,bool>mp;
	getline(cin,s1);
	getline(cin,s2);
	for(int i=0;i<s2.size();i++) s2[i]=toupper(s2[i]),mp[s2[i]]=true;
	for(int i=0;i<s1.size();i++) 
	{
		s1[i]=toupper(s1[i]);
		if(!mp[s1[i]]) 
		{
			cout<<s1[i],mp[s1[i]]=true;
			
		}
	}
	return 0;
}