public KosarajuSCC(Digraph G) {
marked = new boolean[G.V()];
id = new int[G.V()];
DepthFirstOrder order = new DepthFirstOrder(G.reverse());
for (int s : order.reverse())
if (!marked[s]) {
dfs(G, s);
count++;
}
}
private KosarajuSharirSCC(Digraph<V> digraph) {
ids = new HashMap<>(digraph.vertexCount());
visited = new HashSet<>(digraph.vertexCount());
size = new int[digraph.vertexCount()];
DepthFirstOrder<V> dfo = DepthFirstOrder.from(digraph.reverse());
for (V vertex : dfo.reversePost()) {
if (!visited.contains(vertex)) {
dfs(digraph, vertex);
count++;
}
}
}
public KosarajuSCC(Digraph G) {
// compute reverse postorder of reverse graph
DepthFirstOrder dfs = new DepthFirstOrder(G.reverse());
// run DFS on G, using reverse postorder to guide calculation
marked = new boolean[G.V()];
id = new int[G.V()];
for (int v : dfs.reversePost()) {
if (!marked[v]) {
dfs(G, v);
count++;
}
}
// check that id[] gives strong components
assert check(G);
}
public static void main(String[] args) {
In in1 = new In(Inputs.DIGRAPH_SMALL);
In in2 = new In(Inputs.DIGRAPH_SMALL);
edu.princeton.cs.algs4.Digraph sedgewicks = new edu.princeton.cs.algs4.Digraph(in1);
Digraph digraph = new Digraph(in2);
in1.close();
in2.close();
StdOut.printf("Sedgewicks - v: %d, e: %d\n", sedgewicks.V(), sedgewicks.E());
for (int i = 0; i < sedgewicks.V(); i++) {
for (int w : sedgewicks.adj(i)) {
StdOut.printf("%d -> %d\n", i, w);
}
}
StdOut.println();
StdOut.printf("My - v: %d, e: %d\n", digraph.V(), digraph.E());
for (int i = 0; i < digraph.V(); i++) {
for (int w : digraph.adj(i)) {
StdOut.printf("%d -> %d\n", i, w);
}
}
StdOut.println();
edu.princeton.cs.algs4.Digraph sedwickDi = sedgewicks.reverse();
StdOut.printf("Sedgewicks reverse - v: %d, e: %d\n", sedwickDi.V(), sedwickDi.E());
for (int i = 0; i < sedwickDi.V(); i++) {
for (int w : sedwickDi.adj(i)) {
StdOut.printf("%d -> %d\n", i, w);
}
}
StdOut.println();
Digraph myReverse = digraph.reverse();
StdOut.printf("My reverse - v: %d, e: %d\n", myReverse.V(), myReverse.E());
for (int i = 0; i < myReverse.V(); i++) {
for (int w : myReverse.adj(i)) {
StdOut.printf("%d -> %d\n", i, w);
}
}
}
