A directed graph:
a --> b f h
b --> c a
c --> d b
d --> e
e --> d
f --> g
g --> f d
h --> i
i --> h j e c
j -->

Total number of components: 4
Vertex a is in component 3
Vertex b is in component 3
Vertex c is in component 3
Vertex d is in component 0
Vertex e is in component 0
Vertex f is in component 1
Vertex g is in component 1
Vertex h is in component 3
Vertex i is in component 3
Vertex j is in component 2
