Submission #391659

#	Time	Username	Problem	Language	Result	Execution time	Memory
391659		ronnith	Zagrade (COI20_zagrade)	C++14	0 / 100	3077 ms	4928 KiB

zagrade

#include <bits/stdc++.h>

using namespace std;

int n, q;

inline bool query(int l, int r) {
	cout << "? " << l << ' ' << r << endl;
	bool res;
	cin >> res;
	return res;
}

int main() {
	cin >> n >> q;
	set<int> pos;
	for(int i = 1;i <= n;i ++) {
		pos.insert(i);
	}
	char ans[n+1];
	ans[n] = '\0';
	auto it = pos.begin();
	while(it != (--pos.end())) {
		auto crr = (it++);
		if(query(*crr, *it)) {
			ans[(*crr) - 1] = '(';
			ans[(*it) - 1] = ')';
			pos.erase(it);
			it = (crr--);
			pos.erase(it);
			it = crr;
		}
		if((int)pos.size() == 0) {
			break;
		}
	}
	if((int)pos.size()) {
		it = pos.begin();
		for(int rep = 0;rep < (int)pos.size() / 2;rep ++) {
			ans[(*it)-1] = ')';
		}
		while(it != pos.end()) {
			ans[(*it)-1] = '(';
		}
	}
	string out = ans;
	cout << "! " << out << '\n';
	return 0;
}

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