lemon-0.x: src/work/flow_test.cc@8d24100ad408

     1 #include <iostream>

     2 #include <vector>

     3 #include <string>

     5 #include <marci_list_graph.hh>

     6 #include <marci_graph_traits.hh>

     7 #include <marci_property_vector.hh>

     8 #include <preflow_push_hl.hh>

     9 #include <preflow_push_max_flow.hh>

    10 #include <reverse_bfs.hh>

    11 #include <dijkstra.hh>

    13 using namespace hugo;

    16 int main (int, char*[])

    17 {

    18   typedef graph_traits<list_graph>::node_iterator node_iterator;

    19   typedef graph_traits<list_graph>::edge_iterator edge_iterator;

    20   typedef graph_traits<list_graph>::each_node_iterator each_node_iterator;

    21   typedef graph_traits<list_graph>::each_edge_iterator each_edge_iterator;

    22   typedef graph_traits<list_graph>::out_edge_iterator out_edge_iterator;

    23   typedef graph_traits<list_graph>::in_edge_iterator in_edge_iterator;

    24   typedef graph_traits<list_graph>::sym_edge_iterator sym_edge_iterator;

    26   list_graph flow_test;

    28     //Ahuja könyv példája, maxflowvalue=13

    29   node_iterator s=flow_test.add_node();

    30   node_iterator v1=flow_test.add_node();

    31   node_iterator v2=flow_test.add_node();

    32   node_iterator v3=flow_test.add_node();

    33   node_iterator v4=flow_test.add_node();

    34   node_iterator v5=flow_test.add_node();

    35   node_iterator t=flow_test.add_node();

    37   node_property_vector<list_graph, std::string> node_name(flow_test);

    38   node_name.put(s, "s");

    39   node_name.put(v1, "v1");

    40   node_name.put(v2, "v2");

    41   node_name.put(v3, "v3");

    42   node_name.put(v4, "v4");

    43   node_name.put(v5, "v5");

    44   node_name.put(t, "t");

    46   edge_iterator s_v1=flow_test.add_edge(s, v1);

    47   edge_iterator s_v2=flow_test.add_edge(s, v2);

    48   edge_iterator s_v3=flow_test.add_edge(s, v3);

    49   edge_iterator v2_v4=flow_test.add_edge(v2, v4);

    50   edge_iterator v2_v5=flow_test.add_edge(v2, v5);

    51   edge_iterator v3_v5=flow_test.add_edge(v3, v5);

    52   edge_iterator v4_t=flow_test.add_edge(v4, t);

    53   edge_iterator v5_t=flow_test.add_edge(v5, t);

    54   edge_iterator v2_s=flow_test.add_edge(v2, s);

    56   edge_property_vector<list_graph, int> cap(flow_test);

    57   cap.put(s_v1, 0);

    58   cap.put(s_v2, 10);

    59   cap.put(s_v3, 10);

    60   cap.put(v2_v4, 5);

    61   cap.put(v2_v5, 8);

    62   cap.put(v3_v5, 5);

    63   cap.put(v4_t, 8);

    64   cap.put(v5_t, 8);

    65   cap.put(v2_s, 0);

    69   //Marci példája, maxflowvalue=23

    70   /*  node_iterator s=flow_test.add_node();

    71   node_iterator v1=flow_test.add_node();

    72   node_iterator v2=flow_test.add_node();

    73   node_iterator v3=flow_test.add_node();

    74   node_iterator v4=flow_test.add_node();

    75   node_iterator t=flow_test.add_node();

    76   node_iterator w=flow_test.add_node();

    79   node_property_vector<list_graph, std::string> node_name(flow_test);

    80   node_name.put(s, "s");

    81   node_name.put(v1, "v1");

    82   node_name.put(v2, "v2");

    83   node_name.put(v3, "v3");

    84   node_name.put(v4, "v4");

    85   node_name.put(t, "t");

    86   node_name.put(w, "w");

    88   edge_iterator s_v1=flow_test.add_edge(s, v1);

    89   edge_iterator s_v2=flow_test.add_edge(s, v2);

    90   edge_iterator v1_v2=flow_test.add_edge(v1, v2);

    91   edge_iterator v2_v1=flow_test.add_edge(v2, v1);

    92   edge_iterator v1_v3=flow_test.add_edge(v1, v3);

    93   edge_iterator v3_v2=flow_test.add_edge(v3, v2);

    94   edge_iterator v2_v4=flow_test.add_edge(v2, v4);

    95   edge_iterator v4_v3=flow_test.add_edge(v4, v3);

    96   edge_iterator v3_t=flow_test.add_edge(v3, t);

    97   edge_iterator v4_t=flow_test.add_edge(v4, t);

    98   edge_iterator v3_v3=flow_test.add_edge(v3, v3);

    99   edge_iterator s_w=flow_test.add_edge(s, w);

   100   //  edge_iterator v2_s=flow_test.add_edge(v2, s);

   104   edge_property_vector<list_graph, int> cap(flow_test);  //serves as length in dijkstra

   105   cap.put(s_v1, 16);

   106   cap.put(s_v2, 13);

   107   cap.put(v1_v2, 10);

   108   cap.put(v2_v1, 4);

   109   cap.put(v1_v3, 12);

   110   cap.put(v3_v2, 9);

   111   cap.put(v2_v4, 14);

   112   cap.put(v4_v3, 7);

   113   cap.put(v3_t, 20);

   114   cap.put(v4_t, 4);

   115   cap.put(v3_v3, 4);

   116   cap.put(s_w, 4);

   117   //  cap.put(v2_s, 0);

   119 */

   121   //pelda 3, maxflowvalue=4

   122   /*      node_iterator s=flow_test.add_node();

   123   node_iterator v1=flow_test.add_node();

   124   node_iterator v2=flow_test.add_node();

   125   node_iterator t=flow_test.add_node();

   126   node_iterator w=flow_test.add_node();

   128   node_property_vector<list_graph, std::string> node_name(flow_test);

   129   node_name.put(s, "s");

   130   node_name.put(v1, "v1");

   131   node_name.put(v2, "v2");

   132   node_name.put(t, "t");

   133   node_name.put(w, "w");

   135   edge_iterator s_v1=flow_test.add_edge(s, v1);

   136   edge_iterator v1_v2=flow_test.add_edge(v1, v2);

   137   edge_iterator v2_t=flow_test.add_edge(v2, t);

   138   edge_iterator v1_v1=flow_test.add_edge(v1, v1);

   139   edge_iterator s_w=flow_test.add_edge(s, w);

   142   edge_property_vector<list_graph, int> cap(flow_test);

   144   cap.put(s_v1, 16);

   145   cap.put(v1_v2, 10);

   146   cap.put(v2_t, 4);

   147   cap.put(v1_v1, 3);

   148   cap.put(s_w, 5);

   149   */

   154   std::cout << "Testing reverse_bfs..." << std::endl;

   156   reverse_bfs<list_graph> bfs_test(flow_test, t);

   158   bfs_test.run();

   160   for (each_node_iterator w=flow_test.first_node(); w.valid(); ++w) {

   161     std::cout <<"The distance of " << w << " is " << bfs_test.dist(w) <<std::endl;

   162     }

   168   std::cout << "Testing preflow_push_hl..." << std::endl;

   170   preflow_push_hl<list_graph, int> preflow_push_test(flow_test, s, t, cap);

   172   preflow_push_test.run();

   174   std::cout << "Maximum flow value is: " << preflow_push_test.maxflow() << "."<<std::endl;

   176   std::cout<< "The flow on edge s-v1 is "<< preflow_push_test.flowonedge(s_v1) << "."<<std::endl;

   178   edge_property_vector<list_graph, int> flow=preflow_push_test.allflow();

   179   for (each_edge_iterator e=flow_test.first_edge(); e.valid(); ++e) {

   180     std::cout <<"Flow on edge " << flow_test.tail(e) <<"-" << flow_test.head(e)<< " is " <<flow.get(e) <<std::endl;

   181     }

   183   std::cout << "A minimum cut: " <<std::endl;

   184   node_property_vector<list_graph, bool> mincut=preflow_push_test.mincut();

   186   for (each_node_iterator v=flow_test.first_node(); v.valid(); ++v) {

   187       if (mincut.get(v)) std::cout <<node_name.get(v)<< " ";

   188     }

   190   std::cout<<"\n\n"<<std::endl;

   195   std::cout << "Testing preflow_push_max_flow..." << std::endl;

   197   preflow_push_max_flow<list_graph, int> max_flow_test(flow_test, s, t, cap);

   199   max_flow_test.run();

   201   std::cout << "Maximum flow value is: " << max_flow_test.maxflow() << "."<< std::endl;

   203   std::cout << "A minimum cut: " <<std::endl;

   204   node_property_vector<list_graph, bool> mincut2=max_flow_test.mincut();

   206   for (each_node_iterator v=flow_test.first_node(); v.valid(); ++v) {

   207     if (mincut2.get(v)) std::cout <<node_name.get(v)<< " ";

   208   }

   210   std::cout << std::endl <<std::endl;

   214     std::cout << "Testing dijkstra..." << std::endl;

   216     node_iterator root=v2;

   218     dijkstra<list_graph, int> dijkstra_test(flow_test, root, cap);

   220     dijkstra_test.run();

   222     for (each_node_iterator w=flow_test.first_node(); w.valid(); ++w) {

   223       if (dijkstra_test.reach(w)) {

   224       std::cout <<"The distance of " << w << " is " << dijkstra_test.dist(w);

   225       if (dijkstra_test.pred(w).valid()) {

   226       std::cout <<", a shortest path from the root ends with edge " << dijkstra_test.pred(w) <<std::endl;

   227       } else {

   228        std::cout <<", this is the root."<<std::endl; }

   230       } else {

   231 	cout << w << " is not reachable from " << root <<std::endl;

   232       }

   233     }

   237   return 0;

   238 }

author	alpar
	Mon, 23 Feb 2004 17:33:50 +0000
changeset 124	8d24100ad408
parent 33	f505c414feb9
permissions	-rw-r--r--