public static void MainTest(string[] args)
{
// read in digraph from command-line argument
if (args.Length < 1)
{
throw new ArgumentException("Expecting input file");
}
TextInput input = new TextInput(args[0]);
Digraph G = new Digraph(input);
DirectedCycle finder = new DirectedCycle(G);
if (finder.HasCycle)
{
Console.Write("Directed cycle: ");
foreach (int v in finder.GetCycle())
{
Console.Write(v + " ");
}
Console.WriteLine();
}
else
{
Console.WriteLine("No directed cycle");
}
Console.WriteLine();
}
private int[] rank; // rank[v] = position of vertex v in topological order
/// <summary>
/// Determines whether the digraph <c>G</c> has a topological order and, if so,
/// finds such a topological order.</summary>
/// <param name="G">the digraph</param>
///
public Topological(Digraph G)
{
DirectedCycle finder = new DirectedCycle(G);
if (!finder.HasCycle)
{
DepthFirstOrder dfs = new DepthFirstOrder(G);
order = dfs.ReversePost();
rank = new int[G.V];
int i = 0;
foreach (int v in order)
{
rank[v] = i++;
}
}
}
