In the last div3 we had the most qualitative question of this century, an iterative problem where you just use rand and hope that God will listen to you. Thanks again. ~~~~~ void solve(){ ll n; cin>>n; ll arr[3]={1,2,3}; srand(time(0)); while(true){ cout<<"? "<<arr[0]<<" "<<arr[1]<<" "<<arr[2]<<endl; ll x; cin>>x; if(x==0)break; arr[rand()%3]=x; } cout<<"! "<<arr[0]<<" "<<arr[1]<<" "<<arr[2]<<endl; } ~~~~~