Submission #1152452

#	Time	Username	Problem	Language	Result	Execution time	Memory
1152452		YSH2020	Zagrade (COI20_zagrade)	C++20	0 / 100	464 ms	500 KiB

zagrade

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


int ans[1000005];
void solve(int s, int e) {
  ans[s] = 0;
  ans[e] = 1;
  if (e-s == 1) return;
  int last = s;
  for (int i = s+1; i <= e; i += 2) {
    cout << "? " << last+1 << ' ' << i+1 << '\n';
    int x; cin >> x;
    if (x == 1) {
      solve(last, i);
      last = i+1;
    }
  }
}


int main() {
  int n, q; cin >> n >> q;
  //suppose this is a valid bracket sequence.
  solve(0, n-1);
  cout << "! ";
  for (int i = 0; i < n; i++) {
    if (ans[i] == 0) cout << '(';
    else cout << ')';
  }
}

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