7-27 QQ Account Management

题目

题意：L代表登录；R代表注册，，后面为qq号、密码，问qq的几种登录状态

tip：map

#include<iostream>
#include<map>
using namespace std;
int main() {
	int n;
	cin>>n;
	map<string,string> m;//账号+密码
	map<string,int>checked;//是否注册过
	for(int i=0; i<n; ++i) {
		string cmd,qq_no,pw;
		cin>>cmd>>qq_no>>pw;
		if(cmd=="L") {
			if(checked[qq_no]) {
				if(pw==m[qq_no])
					cout<<"Log in Successful\n";
				else cout<<"ERROR: Wrong Password\n";
			} else
				cout<<"ERROR: Account Not Exist\n";
		} else if(cmd=="R") {
			if(checked[qq_no])
				cout<<"ERROR: Account Number Already Exists\n";
			else {
				checked[qq_no]=1;
				m[qq_no]=pw;
				cout<<"Register Successful\n";
			}
		}
	}
	return 0;
}