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  1. #include <iostream>
  2. using namespace std;
  3. int main() {
  4. 	int t;
  5. 	cin>>t;
  6. 	while(t--){
  7. 		int n;
  8. 		cin>>n;
  9. 		int a[n+1], pr[n+1]={0,};
  10. 		for(int i=1; i<=n; i++){
  11. 			cin>>a[i];
  12. 			pr[i]=pr[i-1]+a[i];
  13. 		}
  14. 	int l=1, r=n;
  15. 	while(l<r){
  16. 		int m=(l+r)/2;
  17. 		cout<<"? "<<m-l+1<<" ";
  18. 		for(int i=l; i<=m; i++)
  19. 		cout<<i<<" ";
  20. 		cout<<endl;
  21. 	 int x;
  22. 	 cin>>x;
  23. 	 if(x==pr[m]-pr[l-1])
  24. 	 	l=m+1;
  25. 	 else 
  26. 		r=m;
  27. 	}
  28. 	cout<<"! "<<l<<endl;
  29. 		}
  30. 	}
  31.  
Success #stdin #stdout 0.01s 5324KB
comments (?)
stdin
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2
5
1 2 3 4 5

11

6

3

7
1 2 3 5 3 4 2

12

6
stdout
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? 3 1 2 3 
? 2 1 2 
? 1 1 
! 1
? 4 1 2 3 4 
? 2 1 2 
? 1 1 
! 1
https://ideone.com/jREneO
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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