Submission #337100

#	Time	Username	Problem	Language	Result	Execution time	Memory
337100		MrDomino	Zagrade (COI20_zagrade)	C++14	100 / 100	908 ms	1496 KiB

zagrade

#include <bits/stdc++.h>

using namespace std;

const int N = (int) 1e5 + 7;
int n;
int q;
int a[N];
vector<int> stk;

int main() {
  cin >> n >> q;
  for (int i = 1; i <= n; i++) {
    if (stk.empty()) {
      stk.push_back(i);
      a[i] = +1;
      continue;
    }
    int j = stk.back();
    cout << "? " << j << " " << i << endl;
    int ret;
    cin >> ret;
    if (ret) {
      stk.pop_back();
      a[i] = -1;
    } else {
      stk.push_back(i);
      a[i] = +1;
    }
  }
  int half = (int) stk.size() / 2;
  for (int i = 0; i < half; i++) {
    a[stk[i]] = -1;
  }
  for (int i = half; i < (int) stk.size(); i++) {
    a[stk[i]] = +1;
  }
  cout << "! ";
  for (int i = 1; i <= n; i++) {
    if (a[i] == +1) {
      cout << "(";
    } else {
      cout << ")";
    }
  }
  cout << endl;
}

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