Be sure to apply the errata and change the direction of the edge between F and H.
A topological sorting of this graph would be:
A, B, D, E, C, H, G, I, J, F
After the direction change of the edge between F and H, vertex H has no incoming edges, just like vertex A. If we start DFS at vertex A, according to the "topsort" on page 181, vertex H is supposed to appear at the beginning of the sorting, rather than in the middle:
H, A, B, D, E, C, G, I, J, F
Please correct me if I am wrong.
If the direction from H->F is changed to F->H, then J should be the terminal vertex ?
A pre-order DFS walk should give the ordering : A B C F H G I J D E
The RPO toposort should be : A B D E C F H G I J