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