Submission #1112164

#	Time	Username	Problem	Language	Result	Execution time	Memory
1112164		vako_p	Zagrade (COI20_zagrade)	C++14	100 / 100	1900 ms	3716 KiB

zagrade

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

const int mxN = 1e6 + 5;
ll n,a[mxN],q;
stack<ll> st;
char ch[] = {'(', ')'};

int main(){
    ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin >> n >> q;
	st.push(1);
	ll cnt = n / 2;
	for(int i = 2; i <= n; i++){
		ll l = st.top();
		cout << "? " << l << ' ' << i << endl;
		ll ans;
		cin >> ans;
		if(ans){
			a[l] = 1;
			a[i] = 2;
			st.pop();
			cnt--;
		}
		else st.push(i);
		if(st.empty()) st.push(++i);
	}
	cout << "! ";
	ll val = 2;
	for(int i = 1; i <= n; i++){
		if(a[i] == 0){
			cnt--;
			a[i] = val;
			if(cnt == 0) val = 1;
		}
		cout << ch[a[i] - 1];
	}
	cout << endl;
}

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