Submission #1003936

#	Time	Username	Problem	Language	Result	Execution time	Memory
1003936		vjudge1	Zagrade (COI20_zagrade)	C++17	71 / 100	574 ms	1672 KiB

zagrade

#include <bits/stdc++.h>

using namespace std;

int marc[100005];
stack<int> st;

int main(){
	int n,q; cin>>n>>q;
	cout<<"? "<<1<<" "<<n<<" "<<endl;
	int y; cin>>y;
	if(y == 1){
		marc[n] = 0;
		for(int i = 1; i < n; i++){
			if(st.size() == 0){
				marc[i] = 1;
				st.push(i);
				continue;
			}
			cout<<"? "<<st.top()<<" "<<i<<endl;
			int x; cin>>x;
			if(x == 0){
				marc[i] = 1;
				st.push(i);
			}else{
				marc[i] = 0;
				st.pop();
			}
		}
		cout<<"! ";
		for(int i = 1; i <= n; i++){
			if(marc[i] == 0)cout<<")";
			else cout<<"(";
		}cout<<endl;
		return 0;
	}

	else{
		for(int i = 1; i <= n; i++)marc[i] = -1;
		marc[n] = 1; int qtd = 0;
		for(int i = 1; i < n; i++){
			if(st.size() == 0){
				st.push(i);
				continue;
			}
			cout<<"? "<<st.top()<<" "<<i<<endl;
			int x; cin>>x;
			if(x == 1){
				qtd++;
				marc[st.top()] = 1;
				marc[i] = 0;
				st.pop();
			}else{
				st.push(i);
			}
		}

		for(int i = 1; i <= n; i++)
			if(marc[i] == -1){
				if(qtd < n/2){marc[i] = 0; qtd++;}
				else marc[i] = 1;
			}

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

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