source: lemon-0.x/src/work/marci/leda/bipartite_matching_leda.cc @ 1074:4a24a46407db

// -*- c++ -*-
#include <iostream>
#include <fstream>
#include <vector>
#include <cstdlib>

#include <LEDA/graph.h>
#include <LEDA/mcb_matching.h>
#include <LEDA/list.h>
#include <LEDA/graph_gen.h>

#include <leda_graph_wrapper.h>
#include <sage_graph.h>
//#include <smart_graph.h>
//#include <dimacs.h>
#include <lemon/time_measure.h>
#include <for_each_macros.h>
#include <lemon/graph_wrapper.h>
#include <bipartite_graph_wrapper.h>
#include <lemon/maps.h>
#include <lemon/max_flow.h>

/**
 * Inicializalja a veletlenszamgeneratort.
 * Figyelem, ez nem jo igazi random szamokhoz,
 * erre ne bizzad a titkaidat!
 */
void random_init()
{
        unsigned int seed = getpid();
        seed |= seed << 15;
        seed ^= time(0);

        srand(seed);
}

/**
 * Egy veletlen int-et ad vissza 0 es m-1 kozott.
 */
int random(int m)
{
  return int( double(m) * rand() / (RAND_MAX + 1.0) );
}

using namespace lemon;

int main() {
  //for leda graph
  leda::graph lg;
  //lg.make_undirected();
  typedef LedaGraphWrapper<leda::graph> Graph;
  Graph g(lg);

  //for UndirSageGraph
  //typedef UndirSageGraph Graph; 
  //Graph g;

  typedef Graph::Node Node;
  typedef Graph::NodeIt NodeIt;
  typedef Graph::Edge Edge;
  typedef Graph::EdgeIt EdgeIt;
  typedef Graph::OutEdgeIt OutEdgeIt;

  std::vector<Graph::Node> s_nodes;
  std::vector<Graph::Node> t_nodes;

  int a;
  std::cout << "number of nodes in the first color class=";
  std::cin >> a; 
  int b;
  std::cout << "number of nodes in the second color class=";
  std::cin >> b; 
  int m;
  std::cout << "number of edges=";
  std::cin >> m; 
  

  for (int i=0; i<a; ++i) s_nodes.push_back(g.addNode());
  for (int i=0; i<b; ++i) t_nodes.push_back(g.addNode());

  random_init();
  for(int i=0; i<m; ++i) {
    g.addEdge(s_nodes[random(a)], t_nodes[random(b)]);
  }

  Graph::NodeMap<int> ref_map(g, -1);

  IterableBoolMap< Graph::NodeMap<int> > bipartite_map(ref_map);
  for (int i=0; i<a; ++i) bipartite_map.insert(s_nodes[i], false);
  for (int i=0; i<b; ++i) bipartite_map.insert(t_nodes[i], true);

  typedef BipartiteGraphWrapper<Graph> BGW;
  BGW bgw(g, bipartite_map);

  BGW::NodeMap<int> dbyj(bgw);
  BGW::EdgeMap<int> dbyxcj(bgw);

  typedef stBipartiteGraphWrapper<BGW> stGW;
  stGW stgw(bgw);
  ConstMap<stGW::Edge, int> const1map(1);

  Timer ts;
  stGW::EdgeMap<int> flow(stgw);
  MaxFlow<stGW, int, ConstMap<stGW::Edge, int>, stGW::EdgeMap<int> > 
    max_flow_test(stgw, stgw.S_NODE, stgw.T_NODE, const1map, flow);

  ts.reset();
  FOR_EACH_LOC(stGW::EdgeIt, e, stgw) flow.set(e, 0);
//  while (max_flow_test.augmentOnShortestPath()) { }
  typedef SageGraph MutableGraph;
//  while (max_flow_test.augmentOnBlockingFlow1<MutableGraph>()) {
//   while (max_flow_test.augmentOnBlockingFlow2()) {
//    std::cout << max_flow_test.flowValue() << std::endl;
//   }
  max_flow_test.run();
  std::cout << "max flow value: " << max_flow_test.flowValue() << std::endl;
  std::cout << "elapsed time: " << ts << std::endl;

  ts.reset();
  FOR_EACH_LOC(stGW::EdgeIt, e, stgw) flow.set(e, 0);
  max_flow_test.run();
  std::cout << "pre flow value: " << max_flow_test.flowValue() << std::endl;
  std::cout << "elapsed time: " << ts << std::endl;

  ts.reset();  
  leda_list<leda_edge> ml=MAX_CARD_BIPARTITE_MATCHING(lg);
  std::cout << "leda matching value: " << ml.size() << std::endl;
  std::cout << "elapsed time: " << ts << std::endl;

  return 0;
}