private void DepthFirstTraverse(Digraph <T> digraph, T vertex, HashSet <T> visited, HashSet <T> currentPath, Dictionary <T, T> edgeTo)
{
currentPath.Add(vertex);
visited.Add(vertex);
foreach (var neighbour in digraph.GetNeighbours(vertex))
{
if (HasCycle)
{
return;
}
if (!visited.Contains(neighbour))
{
edgeTo.Add(neighbour, vertex);
DepthFirstTraverse(digraph, neighbour, visited, currentPath, edgeTo);
}
else if (currentPath.Contains(neighbour))
{
cycle = new Stack <T>();
var current = vertex;
while (!current.Equals(neighbour))
{
cycle.Push(current);
current = edgeTo[current];
}
cycle.Push(neighbour);
cycle.Push(vertex);
}
}
currentPath.Remove(vertex);
}
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);
}