out_edges(0): (0,1) (0,2) in_edges(0): (1,0) (2,0) in a directed graph is (u,v) == (v,u) ? 0 weight[(u,v)] = 1.2 weight[(v,u)] = 2.4 in an undirected graph is (u,v) == (v,u) ? 1 weight[(u,v)] = 3.1 weight[(v,u)] = 3.1 the edges incident to v: (0,1)
