Hi Everyone,

Today I encountered a new type of problem which involved an interactive task. The problem link is as follows:

https://atcoder.jp/contests/abc269/tasks/abc269_e

These kind of problems are new to me. Nevertheless, I tried solving it and here is my solution (in C++):

include<bits/stdc++.h>

using namespace std;

define ll long long

int main(){ ll t,i,n,a[4]; cin>>n; while(true){ for(i=0;i<4;i++) a[i]=(rand()%n)+1; cout<<"? "<<a[0]<<" "<<a[1]<<" "<<a[2]<<" "<<a[3]<<endl; // cout<<flush; cin>>t; if(t==0){ cout<<"! "<<a[1]<<" "<<a[3]<<endl; // cout<<flush; exit(0); } if(t==-1) exit(0); } return 0; }

I received WA after submitting this solution. I also tried adding "cout<<flush" which are commented now, but that did not help.

Can someone pls help me to correct the solution?