Submission #640211

#	Time	Username	Problem	Language	Result	Execution time	Memory
640211		christinelynn	Zagrade (COI20_zagrade)	C++17	71 / 100	916 ms	1508 KiB

zagrade

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

#define nyahalo ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define otsumiko exit(0);
#define mikodanye priority_queue<pair<long long, long long>, vector<pair<long long, long long> >, greater<pair<long long, long long> > >
#define mikochi priority_queue<long long, vector<long long>, greater<long long> >

long long n, q, x, a[100069], pi;
stack<long long> stk;

int main() {
  nyahalo
  long long i, j;
  cin >> n >> q;
  for (i=1; i<=n; i++) {
    a[i] = 0;
  }
  a[1] = 1;
  stk.push(1);
  for (i=2; i<=n; i++) {
    if (stk.empty()) {
      stk.push(i);
      a[i] = 1;
    } else {
      pi = stk.top();
      cout << "? " << pi << " " << i << "\n" << flush;
      cin >> x;
      if (x == 1) {
        a[i] = -1;
        stk.pop();
      } else {
        a[i] = 1;
        stk.push(i);
      }
    }
  }
  cout << "! ";
  for (i=1; i<=n; i++) {
    if (a[i] == 1) {
      cout << "(";
    } else {
      cout << ")";
    }
  }
  cout << "\n" << flush;
  otsumiko
}

Compilation message (stderr)

zagrade.cpp: In function 'int main()':
zagrade.cpp:14:16: warning: unused variable 'j' [-Wunused-variable]
   14 |   long long i, j;
      |                ^

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