Submission #1004217

#	Time	Username	Problem	Language	Result	Execution time	Memory
1004217		vjudge1	Zagrade (COI20_zagrade)	C++17	0 / 100	538 ms	3736 KiB

zagrade

#include <bits/stdc++.h>

using namespace std;

const int M = 1e5 + 1;

char ans[M];

bool que(int x,int y)
{
	cout<<"? "<<x<<' '<<y<<endl;
	bool b;
	cin>>b;
	return b;
}

void solve(int a,int b)
{
	if (a>=b)
		return;
	if (a+1==b)
	{
		ans[a]='(';
		ans[b]=')';
		return;
	}
	bool v=que(a+1,b-1);
	if (v)
	{
		ans[a]='(';
		ans[b]=')';
		solve(a+1,b-1);	
		return;
	}
	for (int i=b-2;i>a;i-=2)
	{
		v=que(a,i);
		if (v)
		{
			ans[i+1]='(';
			ans[b]=')';
			solve(a,i);
			solve(i+1,b-1);
			return;
		}
	}
}

int main()
{
	int n,q;
	cin>>n>>q;
	solve(1,n);
	cout<<"! ";
	for (int i=1;i<=n;i++)
		cout<<ans[i];
	cout<<endl;
	
	return 0;
}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 7
• Subtask 3: 0 / 57
• Subtask 4: 0 / 22