Submission #588438

#	Time	Username	Problem	Language	Result	Execution time	Memory
588438		MilosMilutinovic	Planine (COCI21_planine)	C++14	0 / 110	3 ms	1104 KiB

Main

/**
 *    author:  wxhtzdy
 *    created: 03.07.2022 11:30:53
**/
#include <bits/stdc++.h>

using namespace std;

typedef long double ldb;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);  
  int n, h;
  cin >> n >> h;
  vector<int> x(n), y(n);
  for (int i = 0; i < n; i++) {
    cin >> x[i] >> y[i];
  }
  vector<tuple<ldb, int, int>> ev;
  for (int i = 2; i < n - 1; i += 2) {
    ldb L = x[i] + h * (((ldb) x[i - 1] - x[i]) / (ldb) (y[i - 1] - y[i]));
    ldb R = x[i] + h * (((ldb) x[i + 1] - x[i]) / (ldb) (y[i + 1] - y[i]));
    ev.emplace_back(L, 0, i);
    ev.emplace_back(R, 1, i);
  }
  sort(ev.begin(), ev.end());
  set<int> st;
  int ans = 0;
  for (auto& p : ev) {
    if (get<1>(p) == 0) {
      st.insert(get<2>(p));
    } else {
      if (st.find(get<2>(p)) != st.end()) {
        st.clear();
        ans += 1;
      }
    }
  }                 
  cout << ans << '\n';
  return 0;
}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 60