static Node<Vertex> Sort(Vertex[] vertexes)
{
Node<Vertex> head = null;
foreach (Vertex v in vertexes)
{
if (v.Status == Color.White)
{
DFS(v, ref head);
}
}
return head;
}
static void DFS(Vertex v, ref Node<Vertex> head)
{
foreach (Vertex n in v.Neighbors)
{
if (n.Status == Color.White)
{
n.Status = Color.Grey;
DFS(n, ref head);
}
}
v.Status = Color.Black;
Node<Vertex> node = new Node<Vertex>(v);
node.Next = head;
head = node;
}
public static int ShortestPath(Vertex start, Vertex end)
{
Queue<Vertex> queue = new Queue<Vertex>(10);
if (start == null || end == null)
return 0;
start.Status = Color.Grey;
queue.Push(start);
Vertex cur = null;
while (!queue.IsEmpty())
{
cur = queue.Pop();
if (cur == end)
{
break;
}
foreach (Vertex v in cur.Neighbors)
{
if (v.Status == Color.White)
{
v.Status = Color.Grey;
v.Parent = cur;
v.Distance = cur.Distance + 1;
queue.Push(v);
}
}
cur.Status = Color.Black;
}
if (cur.Parent == null)
return 0;
else
return cur.Parent.Distance + 1;
}
public static Dictionary<char, Vertex> CreateGraph(Dictionary<char, char[]> map)
{
Dictionary<char, Vertex> vertexes = new Dictionary<char, Vertex>();
foreach (char key in map.Keys)
{
vertexes.Add(key, new Vertex(key));
}
foreach (KeyValuePair<char, char[]> kvp in map)
{
Vertex[] neighbors = new Vertex[kvp.Value.Length];
int idx = 0;
foreach (char key in kvp.Value)
{
neighbors[idx++] = vertexes[key];
}
vertexes[kvp.Key].Neighbors = neighbors;
}
return vertexes;
}
public Edge()
{
Start = End = null;
Weight = 1;
}
public Vertex(char key)
{
Key = key;
Parent = null;
Status = Color.White;
Distance = 0;
}