Submission #1004082

#	Time	Username	Problem	Language	Result	Execution time	Memory
1004082		vjudge1	Zagrade (COI20_zagrade)	C++17	0 / 100	2 ms	344 KiB

zagrade

#include <bits/stdc++.h>

using namespace std;

const int M = 1e5 + 1;

char ans[M];

void solve(int a,int b)
{
	if (a+1==b)
	{
		ans[a]='(';
		ans[b]=')';
		return;
	}
	cout<<"? "<<a+1<<' '<<b-1<<endl;
	bool v;
	cin>>v;
	if (v)
	{
		ans[a]='(';
		ans[b]=')';
		solve(a+1,b-1);	
		return;
	}
	for (int i=a+1;i<b;i+=2)
	{
		cout<<"? "<<a<<' '<<i<<endl;
		cin>>v;
		if (v)
		{
			int l=i-a+1;
			for (int j=0;j<l/2;j++)
			{
				ans[a+j]='(';
				ans[i-j]=')';
			}
			l=b-i;
			for (int j=0;j<l/2;j++)
			{
				ans[i+1+j]='(';
				ans[b-j]=')';
			}
			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