Submission #1112108

#	Time	Username	Problem	Language	Result	Execution time	Memory
1112108		vako_p	Zagrade (COI20_zagrade)	C++14	0 / 100	9 ms	336 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];
stack<ll> st;

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

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