Submission #781271

#	Time	Username	Problem	Language	Result	Execution time	Memory
781271		kebine	Zagrade (COI20_zagrade)	C++17	100 / 100	801 ms	1548 KiB

zagrade

#include <bits/stdc++.h>
#define int long long
#define fi first
#define se second
#define keish                             ios_base::sync_with_stdio(0);       cin.tie(0); cout.tie(0)
      
using namespace std;

int n, q, ok;

signed main(){
      keish;
  cin >> n >> q;
      
      vector<char> c(n + 5);
      vector<int> v;
      v.push_back(1);
      
      int cnt = n / 2;
      for(int i = 2; i <= n; i++){
            if(v.empty()){
                  v.push_back(i);
                  continue;
            }
            cout << "? " << v.back() << " " << i << endl;
            cin >> ok;
            if(ok){
                  c[v.back()] = '(';
                  c[i] = ')';
                  cnt--;
                  v.pop_back();
            }else{
                  v.push_back(i);
            }
      }

      for(auto x : v){
            if(cnt) c[x] = ')', cnt--;
            else c[x] = '(';
      }
      
      cout << "! ";
      for(int i = 1; i <= n; i++) cout << c[i];
      cout << endl;
}     

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