哈希表应用使用map，所以写起来并不难

1、主函数

感觉有点像map的简单应用，把所有条件都进行处理判断就行

#include <iostream>
#include<string>
#include<unordered_map>
#include<algorithm>
using namespace std;
#define endl '\n'int main()
{std::ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);unordered_map<string ,string>m;int n;cin>>n;while(n--){string person,account,password;cin>>person>>account>>password;if(person=="L"){if(m.find(account)==m.end()){cout<<"ERROR: Not Exist"<<endl;continue;}else if(m[account]!=password){cout<<"ERROR: Wrong PW"<<endl;continue;}cout<<"Login: OK"<<endl;}else{if(m.find(account)!=m.end()){cout<<"ERROR: Exist"<<endl;continue;}m[account]=password;cout<<"New: OK"<<endl;}}return 0;
}