typedef adjacency_list<listS, distributedS<mpi_process_group, vecS>,
bidirectionalS> Graph;
typedef graph_traits<Graph>::vertex_descriptor Vertex;
- typedef graph_traits<Graph>::edge_descriptor Edge;
typedef std::pair<std::size_t, std::size_t> E;
E edges[3] = { E(0,3), E(1,4), E(2,5) };