Submission #345452

#	Time	Username	Problem	Language	Result	Execution time	Memory
345452		pggp	Zagrade (COI20_zagrade)	C++14	100 / 100	1240 ms	900 KiB

zagrade

#include <bits/stdc++.h>

using namespace std;

int N, Q;
char output[250000];

int main(){
	cin.tie(0);
	cout.tie(0);
	ios_base::sync_with_stdio(false);
	for (int i = 0; i < N; ++i)
	{
		output[i] = '?';
	}

	cin >> N >> Q;
	stack < int > last_non_valid;
	for (int i = 0; i < N; ++i)
	{
		if(last_non_valid.empty()){
			last_non_valid.push(i);
			continue;
		}
		cout << "? " << last_non_valid.top() + 1 << " " << i + 1 << endl;
		bool valid;
		cin >> valid;
		if(valid){
			output[last_non_valid.top()] = '(';
			output[i] = ')';
			last_non_valid.pop();
		}
		else{
			last_non_valid.push(i);
		}
	}
	int s = last_non_valid.size();
	for (int i = 0; i < s/2; ++i)
	{
		output[last_non_valid.top()] = '(';
		last_non_valid.pop();
	}
	for (int i = s/2; i < s; ++i)
	{
		output[last_non_valid.top()] = ')';
		last_non_valid.pop();
	}

	cout << "! ";

	for (int i = 0; i < N; ++i)
	{
		cout << output[i];
	}
	cout << endl;
}

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