Submission #1328913

#	Time	Username	Problem	Language	Result	Execution time	Memory
1328913		avighna	Infinite Race (EGOI24_infiniterace2)	C++20	100 / 100	194 ms	19112 KiB

Main

#include <bits/stdc++.h>

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

  int n, q;
  cin >> n >> q;

  set<int> left, right;
  for (int i = 1; i < n; ++i) {
    right.insert(i);
  }

  int ans = 0;
  while (q--) {
    int x;
    cin >> x;
    if (x > 0) {
      if (right.contains(x)) {
        left.insert(x), right.erase(x);
      } else {
        left.erase(x);
        for (const int &i : left) {
          right.insert(i);
        }
        left.clear();
        left.insert(x);
        ans++;
      }
    } else {
      if (left.contains(-x)) {
        left.erase(-x), right.insert(-x);
      }
    }
  }

  cout << ans << '\n';
}

• Subtask 1: 29 / 29
• Subtask 2: 34 / 34
• Subtask 3: 22 / 22
• Subtask 4: 15 / 15