A. Tom Riddle's Diary codeforces solution

 problem : https://codeforces.com/problemset/problem/855/A

#include<bits/stdc++.h>

using namespace std;

main()

{

    int t;

    map<string ,int> m;

    cin>>t;

    while(t--)

    {   string s;

        cin>>s;

        if(m[s]==0) cout<<"NO"<<endl;

        else cout<<"YES"<<endl;

        m[s]++;

    }

    return 0;

}