제출 #1342240

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1342240		ramzialoulou	Fire (BOI24_fire)	C++20	0 / 100	18 ms	2648 KiB

Main

#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int n, m;
  cin >> n >> m;
  vector<pair<int, int>> a(n);
  for (auto& [x, y] : a) {
    cin >> x >> y;
    if (x > y) {
      assert(y == 0);
      y = m - 1;
    }
  }
  sort(a.begin(), a.end());
  int R = -1;
  priority_queue<int> pq;
  int ans = -1;
  int i = 0;
  for (int p = 1; p <= n; p++) {
    while (i < n && a[i].first <= R + 1) {
      pq.push(a[i].second);
      i++;
    }
    if (pq.empty() || pq.top() == R) {
      break;
    }
    R = pq.top();
    if (R == m - 1) {
      ans = p;
      break;
    }
  }
  cout << ans << '\n';
  return 0;
}

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