Submission #1003868

#	Time	Username	Problem	Language	Result	Execution time	Memory
1003868		vjudge1	Zagrade (COI20_zagrade)	C++17	14 / 100	751 ms	680 KiB

zagrade

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
#define pii pair<int,int>
#define tii tuple<int,int,int,int,int>
#define all(x) x.begin(),x.end()
#define allr(x) x.rbegin(),x.rend()

vector<char> ans;
int n;

bool ask(int l, int r){
	cout << "? " << l << " " << r << endl;
	int rt; cin >> rt;
	return rt;
}

void solve(int l, int r){
	if(r<l) return;

	for(int i=l+1; i<=r; i+=2){
		if(ask(l,i)){
			ans[l]='(';
			ans[i]=')';
			solve(l+1,i-1);
			solve(i+1,r);
			break;
		}
	}

	return;
}

signed main(){
	int q; cin >> n >> q;
	ans.resize(n+1);
	solve(1,n);
	cout << "! ";
	for(int i=1; i<=n; i++) cout << ans[i];
	cout << endl;
}

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