Submission #1004083

#	Time	Username	Problem	Language	Result	Execution time	Memory
1004083		vjudge1	Zagrade (COI20_zagrade)	C++17	100 / 100	554 ms	1808 KiB

zagrade

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

#define ll long long
int const N=2e5+5;
int const mod=1e9+7;


int main(){
	int n,q;
	cin>>n>>q;
	int a=0;
	string s="";
	vector<int> st;
	for(int i=0;i<n;i++){
		if(st.size()==0){
			st.push_back(i);
			s+='?';
			continue;
		}
		cout<<"? "<<(st.back())+1<<' '<<i+1<<endl;
		bool bl;
		cin>>bl;
		if(bl){
			s+=')';
			s[st.back()]='(';
			st.pop_back();
		}
		else{
			s+='?';
			st.push_back(i);
		}
	}
	int sz=st.size();
	for(int i=0;i<sz;i++){
		if(i<sz/2)
			s[st[i]]=')';
		else
			s[st[i]]='(';
	}
	cout<<"! "<<s<<endl;
	return 0;
}

Compilation message (stderr)

zagrade.cpp: In function 'int main()':
zagrade.cpp:12:6: warning: unused variable 'a' [-Wunused-variable]
   12 |  int a=0;
      |      ^

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