#include <bits/stdc++.h>
 
typedef long long ll;
using namespace std;

void solve(){
    int n; cin>>n;
    int hsh[n+1];
    for(int i=0; i<n; i++){
        hsh[i+1] = 0;
    }

    for(int i=0;i<n; i++){
        int x; cin>>x;
        hsh[x]+=1;
    }

    int flag =1;
    for(int i=1; i<=n; i++) if(hsh[i] !=1) flag =-1;
        
    if(flag == 1) cout<<"YES"<<"\n";
    else cout<<"NO"<<"\n";

    return;

}

int main(){   
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int t; cin>>t;

    while(t--){
        solve();
    }

    return 0;

}