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  1. /**
  2.  * code generated by JHelper
  3.  * More info: https://g...content-available-to-author-only...b.com/AlexeyDmitriev/JHelper
  4.  * @author gainullin.ildar
  5.  */
  6.  
  7. #include <iostream>
  8. #include <vector>
  9. #include <algorithm>
  10. #include <string>
  11. #include <set>
  12. #include <map>
  13. #include <list>
  14. #include <time.h>
  15. #include <math.h>
  16. #include <random>
  17. #include <deque>
  18. #include <queue>
  19. #include <cassert>
  20.  
  21. using namespace std;
  22.  
  23. const int N = 1e5 + 7;
  24.  
  25. vector<int> g[N];
  26. int tin[N], tout[N];
  27. int sz[N];
  28. int tt = 1;
  29.  
  30. void dfs(int v)
  31. {
  32.     tin[v] = tt++;
  33.     sz[v] = 1;
  34.     for (auto to : g[v])
  35.     {
  36.         dfs(to);
  37.         sz[v] += sz[to];
  38.     }
  39.     tout[v] = tt++;
  40. }
  41.  
  42. bool pr(int a, int b)
  43. {
  44.     return (tin[a] <= tin[b] && tout[a] >= tout[b]);
  45. }
  46.  
  47. class Main
  48. {
  49. public:
  50.     void solve(std::istream &in, std::ostream &out)
  51.     {
  52.         int n, m, k, q;
  53.         in >> n >> m >> k >> q;
  54.         tt = 1;
  55.         for (int i = 1; i <= n; i++)
  56.         {
  57.             tin[i] = tout[i] = 0;
  58.             g[i].clear();
  59.         }
  60.         vector<int> ind(m + 1, -1);
  61.         vector<bool> root(n + 1, true);
  62.         for (int i = 0; i < k; i++)
  63.         {
  64.             int v, a;
  65.             in >> v >> a;
  66.             if (ind[a] != -1)
  67.             {
  68.                 g[ind[a]].push_back(v);
  69.                 root[v] = false;
  70.             }
  71.             ind[a] = v;
  72.         }
  73.         for (int i = 1; i <= n; i++)
  74.         {
  75.             if (root[i])
  76.             {
  77.                 dfs(i);
  78.             }
  79.         }
  80.         for (int i = 0; i < q; i++)
  81.         {
  82.             int v, a;
  83.             in >> v >> a;
  84.             a = ind[a];
  85.             if (a == -1)
  86.             {
  87.                 out << 0 << '\n';
  88.             }
  89.             else
  90.             {
  91.                 if (pr(v, a))
  92.                 {
  93.                     out << sz[v] << '\n';
  94.                 }
  95.                 else
  96.                 {
  97.                     out << 0 << '\n';
  98.                 }
  99.             }
  100.         }
  101.     }
  102. };
  103.  
  104.  
  105. int main()
  106. {
  107.     ios::sync_with_stdio(0);
  108.     Main solver;
  109.     std::istream &in(std::cin);
  110.     std::ostream &out(std::cout);
  111.     solver.solve(in, out);
  112.     return 0;
  113. }
  114.  
Success #stdin #stdout 0.01s 18744KB
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https://ideone.com/8cH3RX
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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