public Digraph reverse() {
Digraph rDigraph = new Digraph(V);
for (int v = 0; v < V; v++) {
for (int w : adj[v]) {
rDigraph.addEdge(w, v);
}
}
return rDigraph;
}
public static void main(String[] args) {
File tFile = new File("algs4-data//tinyDG.txt");
In in = new In(tFile);
Digraph g = new Digraph(in);
System.out.println(g);
System.out.println(g.reverse());
}