PTA 7-15 QQ帳戶的申請與登陸 （25 分）

#include <bits/stdc++.h>
using namespace std;
map<string, string> M;
int main()
{
	#ifdef ONLINE_JUDGE
	#else
	freopen("in.txt", "r", stdin);
	#endif
	
	int N;
	scanf("%d", &N);
	char a1;
	string a2, a3;
	
	while(N--){
		cin >> a1;
		cin >> a2 >> a3;
		
		if(a1 == 'N'){
			if(M.find(a2) == M.end()){
				M[a2] = a3;
				printf("New: OK\n");
			}else{
				printf("ERROR: Exist\n");
			}
		}
		if(a1 == 'L'){
			if(M.find(a2) == M.end()){
				printf("ERROR: Not Exist\n");
			}else{
				map<string, string>:: iterator it;
				it = M.find(a2);
				
				if(it->second == a3){
					printf("Login: OK\n");
				}else{
					printf("ERROR: Wrong PW\n");
				}
			}
		} 
	}
	
	return 0;
}