codeforces 855A - Tom Riddle's Diary

#include<bits/stdc++.h>
using namespace std;
int main(){
int n;
while(cin>>n)
{
map <string,int> a;
a.clear();
int i;
string  s;
for(i=1;i<=n;i++)
{
cin>>s;
if(a[s]==0){
cout<<"NO"<<endl;
a[s]=1;
}
else cout<<"YES"<<endl;
}
}
return 0;
}