Submission #1081408

#	Time	Username	Problem	Language	Result	Execution time	Memory
1081408		juicy	Zagrade (COI20_zagrade)	C++17	100 / 100	624 ms	1772 KiB

zagrade

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

int main() {
  ios::sync_with_stdio(false); cin.tie(nullptr);

  auto qry = [&](int i, int j) {
    cout << "? " << i + 1 << " " << j + 1 << endl;
    int r; cin >> r;
    return r;
  };
  int n, q; cin >> n >> q;
  string s(n, '(');
  vector<int> st{0};
  int cnt = n / 2;
  for (int i = 1; i < n; ++i) {
    if (st.size() && qry(st.back(), i)) {
      s[i] = ')';
      --cnt;
      st.pop_back();
    } else {
      st.push_back(i);
    }
  }
  for (int i = 0; i < cnt; ++i) {
    s[st[i]] = ')';
  }
  cout << "! " << s << endl;
  return 0;
}

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