제출 #1153694

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1153694		gelastropod	Zagrade (COI20_zagrade)	C++20	100 / 100	224 ms	1924 KiB

zagrade

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

signed main() {
	int N, Q, x;
	cin >> N >> Q;
	stack<int> stk;
	stk.push(-1);
	stk.push(0);
	vector<int> close(N, -1); //-1 unknown, 0 open, 1 close
	for (int i = 1; i < N; i++) {
		if (stk.top() == -1) {
			stk.push(i);
			continue;
		}
		cout << "? " << stk.top() + 1 << ' ' << i + 1 << endl;
		cin >> x;
		if (x) {
			close[stk.top()] = 0;
			close[i] = 1;
			stk.pop();
		}
		else
			stk.push(i);
	}
	int unknown = 0;
	for (auto i : close)
		if (i == -1)
			unknown++;
	int count = 0;
	for (int i = 0; i < N && count < unknown / 2; i++) {
		if (close[i] == -1) {
			close[i] = 1;
			count++;
		}
	}
	cout << "! ";
	for (auto i : close)
		cout << (i > 0 ? ')' : '(');
	cout << endl;
}

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