map的应用：

#include<iostream>
#include<algorithm>
#include<cstring>
#include<cmath>
#include<map>
#include<cstdio>
using namespace std;
int main(){
	map<long long int,string>mp;
	int n;
	string s="myQQ@qq.com";
	string s1;
	long long int a;
	char ch;
	cin>>n;
	while(n--){
		cin>>ch;
		if(ch=='N'){
			scanf("%lld",&a);
			cin>>s1;
			if(mp.find(a)==mp.end()){
				cout<<"New: OK"<<endl;
				mp[a]=s1;
			}else{
				cout<<"ERROR: Exist"<<endl;
			}
			
		}else if(ch=='L'){
			scanf("%lld",&a);
			cin>>s1;
			if(mp.find(a)==mp.end()){
				cout<<"ERROR: Not Exist"<<endl;
			}else if(s1==mp[a]){
				cout<<"Login: OK"<<endl;
			}else {
				cout<<"ERROR: Wrong PW"<<endl;
			}
		}
	}
	return 0;
}