public DirectedDfs(Digraph <T> digraph, T source)
{
if (digraph == null)
{
throw new ArgumentNullException(nameof(digraph));
}
if (!digraph.Vertices.Contains(source))
{
throw new ArgumentOutOfRangeException(nameof(source));
}
marked = new HashSet <T>(digraph.VertexNumber);
Dfs(digraph, source);
}
private void DepthFirstTraverse(Digraph <T> digraph, T vertex, HashSet <T> visited)
{
preOrder.Enqueue(vertex);
visited.Add(vertex);
foreach (var neighbour in digraph.GetNeighbours(vertex))
{
if (!visited.Contains(neighbour))
{
DepthFirstTraverse(digraph, neighbour, visited);
}
}
postOrder.Enqueue(vertex);
reversePostOrder.Push(vertex);
}
public DirectedCycle(Digraph <T> digraph)
{
if (digraph == null)
{
throw new ArgumentNullException(nameof(digraph));
}
var currentPath = new HashSet <T>();
var edgeTo = new Dictionary <T, T>();
var visited = new HashSet <T>(digraph.VertexNumber);
foreach (var vertex in digraph.Vertices)
{
if (!visited.Contains(vertex))
{
DepthFirstTraverse(digraph, vertex, visited, currentPath, edgeTo);
}
}
}
public DepthFirstOrder(Digraph <T> digraph)
{
if (digraph == null)
{
throw new ArgumentNullException(nameof(digraph));
}
postOrder = new Queue <T>(digraph.VertexNumber);
preOrder = new Queue <T>(digraph.VertexNumber);
reversePostOrder = new Stack <T>(digraph.VertexNumber);
var visited = new HashSet <T>(digraph.VertexNumber);
foreach (var vertex in digraph.Vertices)
{
if (!visited.Contains(vertex))
{
DepthFirstTraverse(digraph, vertex, visited);
}
}
}
