src/demo/dijkstra_demo.cc
author athos
Mon, 11 Apr 2005 15:46:14 +0000
changeset 1339 26a88d12d1a6
permissions -rw-r--r--
A little has been done. Some important questions arised.
     1 #include <iostream>
     2 
     3 #include <lemon/list_graph.h>
     4 #include <lemon/dijkstra.h>
     5 
     6 using namespace lemon;
     7 
     8 
     9 int main (int, char*[])
    10 {
    11 
    12     typedef ListGraph Graph;
    13     typedef Graph::Node Node;
    14     typedef Graph::Edge Edge;
    15     typedef Graph::EdgeMap<int> LengthMap;
    16 
    17     Graph g;
    18 
    19     //An example from Ahuja's book
    20 
    21     Node s=g.addNode();
    22     Node v2=g.addNode();
    23     Node v3=g.addNode();
    24     Node v4=g.addNode();
    25     Node v5=g.addNode();
    26     Node t=g.addNode();
    27 
    28     Edge s_v2=g.addEdge(s, v2);
    29     Edge s_v3=g.addEdge(s, v3);
    30     Edge v2_v4=g.addEdge(v2, v4);
    31     Edge v2_v5=g.addEdge(v2, v5);
    32     Edge v3_v5=g.addEdge(v3, v5);
    33     Edge v4_t=g.addEdge(v4, t);
    34     Edge v5_t=g.addEdge(v5, t);
    35   
    36     LengthMap len(g);
    37 
    38     len.set(s_v2, 10);
    39     len.set(s_v3, 10);
    40     len.set(v2_v4, 5);
    41     len.set(v2_v5, 8);
    42     len.set(v3_v5, 5);
    43     len.set(v4_t, 8);
    44     len.set(v5_t, 8);
    45 
    46     std::cout << "The id of s is " << g.id(s)<< ", the id of t is " << g.id(t)<<"."<<std::endl;
    47 
    48     std::cout << "Dijkstra algorithm test..." << std::endl;
    49 
    50     Dijkstra<Graph, LengthMap> dijkstra_test(g,len);
    51     
    52     dijkstra_test.run(s);
    53 
    54     
    55     std::cout << "The distance of node t from node s: " << dijkstra_test.dist(t)<<std::endl;
    56 
    57     std::cout << "The shortest path from s to t goes through the following nodes (the first one is t, the last one is s): "<<std::endl;
    58 
    59     for (Node v=t;v != s; v=dijkstra_test.predNode(v)){
    60 	std::cout << g.id(v) << "<-";
    61     }
    62     std::cout << g.id(s) << std::endl;	
    63     
    64 
    65     return 0;
    66 }
    67 
    68 
    69 
    70 
    71 
    72 
    73 
    74 
    75