24 {

    24 {

    25     typedef adjacency_list<vecS, vecS, directedS, no_property,

    25     typedef adjacency_list<vecS, vecS, directedS, no_property,

    26         property<edge_weight_t, int> > Graph;

    26         property<edge_weight_t, int> > Graph;

    27 

    27 

    28     Graph graph;

    28     Graph graph;

    29     Graph::vertex_descriptor v1, v2, v3, v4;

    33     Graph::vertex_descriptor v1, v2, v3, v4;

    30 

    34 

    31     v1 = add_vertex(graph);

    36     v1 = add_vertex(graph);

    32     v2 = add_vertex(graph);

    37     v2 = add_vertex(graph);

    33     v3 = add_vertex(graph);

    38     v3 = add_vertex(graph);

    34     v4 = add_vertex(graph);

    39     v4 = add_vertex(graph);

    35 

    40