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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int Q, points;
  6.     cin >> Q;
  7.  
  8.     vector<pair<int, int>> b;  // Stores events (position, type)
  9.  
  10.     // Read intervals
  11.     for (int i = 0; i < Q; i++) {
  12.         int L, R;
  13.         cin >> L >> R;
  14.         b.push_back({L, 0}); // Start of an interval
  15.         b.push_back({R, 2}); // End of an interval
  16.     }
  17.  
  18.     cin >> points;
  19.     vector<int> queries(points);
  20.  
  21.     // Read query points
  22.     for (int i = 0; i < points; i++) {
  23.         cin >> queries[i];
  24.         b.push_back({queries[i], 1}); // Query point
  25.     }
  26.  
  27.     // Sort events: (position, type)
  28.     sort(b.begin(), b.end());
  29.  
  30.     map<int, int> G;
  31.     int c = 0; // Active interval count
  32.  
  33.     // Process events using Sweep Line
  34.     for (auto &event : b) {
  35.         int point = event.first;
  36.         int type = event.second;
  37.  
  38.         if (type == 0) {
  39.             c++;  // Start of an interval
  40.         } else if (type == 1) {
  41.             G[point] = c;  // Query point → store current active count
  42.         } else {
  43.             c--;  // End of an interval
  44.         }
  45.     }
  46.  
  47.     // Output results for each query
  48.     for (int i = 0; i < points; i++) {
  49.         cout << G[queries[i]] << endl;
  50.     }
  51.  
  52.     return 0;
  53. }
  54.  
Success #stdin #stdout 0.02s 5284KB
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https://ideone.com/4hsBNh
language:
C++ (gcc 8.3)
created:
12 days ago
visibility:
public

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