Submission #1003858

#	Time	Username	Problem	Language	Result	Execution time	Memory
1003858		vjudge1	Zagrade (COI20_zagrade)	C++17	0 / 100	1 ms	344 KiB

zagrade

#include<bits/stdc++.h>
using namespace std;

//cout.flush();
const int MAXN=100010;
int resp[MAXN];

int main(){
	int n, q;
	cin >> n >> q;
	cout << "? 1 " << n;
	std::cout << std::flush;

	int ehVal;
	cin >> ehVal;

	if(ehVal){
		resp[1] = 1;
		int a = 1, f = 0;
		stack <int> s;
		s.push(1);
		int l = 1;
		for(int i=2; i<n; i++){
			if(l==0){
				a++;
				resp[i] = 1;
				s.push(i);
				l = i;
				continue;
			}
			cout << "? " << l << " " << i;
			std::cout << std::flush;
			int val;
			cin >> val;
			if(val){
				f++;
				resp[i] = 2;
				s.pop();
				if(s.empty()) l = 0;
				else l = s.top();
			}
			else{
				a++;
				resp[i] = 1;
				s.push(i);
				l = i;
			}
		}

		resp[n] = 2;

		cout << "! ";
		for(int i=1; i<=n; i++){
			if(resp[i]==1) cout << "(";
			else cout << ")";
		}
		return 0;
	}

	resp[1] = 2;

}

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