public Topological(EdgeWeightedDigraph g)
{
//EdgeWeightedDirectedCycle cycleFinder = new EdgeWeightedDirectedCycle(g);
//if (!cycleFinder.HasCycle())
//{
DepthFirstOrder dfs = new DepthFirstOrder(g);
this.Order = dfs.ReversePost;
//}
}
public Topological(Digraph g)
{
DirectedCycle cycleFinder = new DirectedCycle(g);
if (!cycleFinder.HasCycle())
{
DepthFirstOrder dfs = new DepthFirstOrder(g);
this.Order = dfs.ReversePost;
}
}
/// <summary>
/// Computes the connected components of the directed graph G.
/// </summary>
/// <param name="g"></param>
public KosarajuSCC(Digraph g)
{
this.Marked = new bool[g.V];
this.ID = new int[g.V];
DepthFirstOrder order = new DepthFirstOrder(g.Reverse());
foreach (int v in order.ReversePost)
if (!this.Marked[v])
{
this.dfs(g, v);
this.Count++;
}
}
public void TestKosarajuSCCHasNotCycle()
{
Digraph g = new Digraph(6);
g.AddEdge(0, 1);
g.AddEdge(1, 2);
g.AddEdge(2, 3);
g.AddEdge(0, 4);
g.AddEdge(4, 5);
Debug.WriteLine(g.ToString());
DepthFirstOrder dfs = new DepthFirstOrder(g);
StringBuilder sb = new StringBuilder();
foreach (var item in dfs.ReversePost)
sb.Append(item + " ");
Debug.WriteLine(sb.ToString());
KosarajuSCC scc = new KosarajuSCC(g);
sb.Clear();
for (int i = 0; i < scc.ID.Length; i++)
sb.Append(i + " - " + scc.ID[i] + Environment.NewLine);
Debug.WriteLine(sb.ToString());
}