public void InsertEdge(Graph g, bool directed, Node x, Node y)
{
var nodeList = g.Edges.Single(edge => edge.First.Value.Equals(x));
nodeList.AddAfter(nodeList.First, y);
if (!directed)
{
this.InsertEdge(g, true, y, x);
}
}
public void DFS(Graph g, Node start, List<LinkedListNode<Node>> discovered, List<LinkedListNode<Node>> processed)
{
var startNode = g.Edges.FirstOrDefault(lNode => lNode.First.Value.Equals(start)).First;
discovered.Add(startNode);
this.ProcessNodeEarly(startNode.Value);
var nextNode = startNode.Next;
while (nextNode != null)
{
this.ProcessEdge(startNode.Value, nextNode.Value);
var nextNode2 = g.Edges.FirstOrDefault(lNode => lNode.First.Value.Equals(nextNode.Value)).First;
if (!discovered.Contains(nextNode2))
{
discovered.Add(nextNode2);
this.DFS(g, nextNode2.Value, discovered, processed);
}
nextNode = nextNode.Next;
}
processed.Add(startNode);
}
public void BFS(Graph g, Node start)
{
List<LinkedListNode<Node>> discovered = new List<LinkedListNode<Node>>();
List<LinkedListNode<Node>> processed = new List<LinkedListNode<Node>>();
Dictionary<LinkedListNode<Node>, LinkedListNode<Node>> nodeToParent = new Dictionary<LinkedListNode<Node>, LinkedListNode<Node>>();
var startNode = g.Edges.FirstOrDefault(lNode => lNode.First.Value.Equals(start)).First;
var q = new Queue<LinkedListNode<Node>>();
q.Enqueue(startNode);
discovered.Add(startNode);
nodeToParent[startNode] = null;
while (q.Any())
{
var currentNode = q.Dequeue();
this.ProcessNodeEarly(currentNode.Value);
processed.Add(currentNode);
var nextNode = currentNode.Next;
while (nextNode != null)
{
this.ProcessEdge(currentNode.Value, nextNode.Value);
var nextNode2 = g.Edges.FirstOrDefault(lNode => lNode.First.Value.Equals(nextNode.Value)).First;
if (!discovered.Contains(nextNode2))
{
q.Enqueue(nextNode2);
discovered.Add(nextNode2);
nodeToParent[nextNode2] = currentNode;
}
nextNode = nextNode.Next;
}
}
Console.WriteLine("Node to parent: ");
foreach (var kvp in nodeToParent)
{
var val = kvp.Value != null ? kvp.Value.Value.Y.ToString() : string.Empty;
Console.WriteLine(kvp.Key.Value.Y + " from " + val);
}
}
private void ProcessNodeEarly(Node current)
{
Console.WriteLine("Vertex: " + current.Y);
}
private void ProcessEdge(Node start, Node end)
{
Console.WriteLine("Edge: " + start.Y + " to " + end.Y);
}