제출 #781277

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
781277		andecaandeci	Zagrade (COI20_zagrade)	C++17	71 / 100	784 ms	1196 KiB

zagrade

#include <bits/stdc++.h>
#define int long long
#define pb push_back
#define pii pair<int, int>
#define fr first
#define sc second
#define query(l, r)                                                              cout << "? " << l << " " << r << endl;                                         cin >> res;
using namespace std;

const int N = 1e5 + 5;

string ans;
bool res;

signed main() {
  ios_base::sync_with_stdio(false);
  cout.tie(NULL);
  cin.tie(NULL);
  int n, q;
  cin >> n >> q;
  ans.assign(n, ' ');
  for (int i = 0; i < n / 2; i++)
    ans[i] = ')';
  for (int i = n / 2; i < n; i++)
    ans[i] = '(';
  stack<int> s;
  s.push(1);
  for (int i = 2; i <= n; i++) {
    if (s.empty()) {
      s.push(i);
      continue;
    }
    int cur = s.top();
    query(cur, i);
    if (res) {
      ans[cur - 1] = '(';
      ans[i - 1] = ')';
      s.pop();
    } else
      s.push(i);
  }
  cout << "! " << ans << endl;
}

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