# source:lemon-0.x/src/work/jacint/graph_gen.h@558:4cbfb435ec2b

Last change on this file since 558:4cbfb435ec2b was 558:4cbfb435ec2b, checked in by marci, 17 years ago

random graph, random bipartite graph in jacint/graph_gen.h

File size: 1.7 KB
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[534]1// -*- c++ -*-
2#include <vector>
3#include <cstdlib>
4
5namespace hugo {
6
7
8  /**
9   * Inicializalja a veletlenszamgeneratort.
10   * Figyelem, ez nem jo igazi random szamokhoz,
11   * erre ne bizzad a titkaidat!
12   */
13  void random_init()
14  {
15    unsigned int seed = getpid();
16    seed |= seed << 15;
17    seed ^= time(0);
18
19    srand(seed);
20  }
21
22
23  /**
24   * Egy veletlen int-et ad vissza 0 es m-1 kozott.
25   */
26  int random(int m)
27  {
28    return int( double(m) * rand() / (RAND_MAX + 1.0) );
29  }
30
31
[558]32  /// Generates a random graph with n nodes and m edges.
33  /// Before generating the random graph, \c g.clear() is called.
[534]34  template<typename Graph>
[558]35  void randomGraph(Graph& g, int n, int m) {
[534]36    g.clear();
[558]37    std::vector<typename Graph::Node> nodes;
[534]38    for (int i=0; i<n; ++i)
40    for (int i=0; i<m; ++i)
42  }
43
[558]44  /// Generates a random bipartite graph with a and b nodes
45  /// in the color classes and m edges.
46  /// According to the bipartite graph concept, the resulting
47  /// graph is directed from the first class to the second one.
48  /// Before generating the random graph, \c g.clear() is called.
49  template<typename Graph>
50  void randomBipartiteGraph(Graph& g, int a, int b, int m) {
51    g.clear();
52    std::vector<typename Graph::Node> s_nodes;
53    std::vector<typename Graph::Node> t_nodes;
54    for (int i=0; i<a; ++i)
55      ///\bug g.addNode(g.S_CLASS) would be better.