// Q4 BFS
public static List<LinkedList> Tree2LinkedList(BinarySearchTree.Node Root)
{
List<LinkedList> Result;
if (Root == null)
return null;
else
{
Result = new List<LinkedList>();
Queue<BinarySearchTree.Node> Queue = new Queue<BinarySearchTree.Node>();
Queue<int> QLevels = new Queue<int>();
Queue.Enqueue(Root);
QLevels.Enqueue(0);
Result.Add(new LinkedList());
Result[0].Add(Root);
while (Queue.Count != 0)
{
BinarySearchTree.Node TempNode = Queue.Dequeue();
LinkedList TempLinkedList;
int Level = QLevels.Dequeue();
if (TempNode != null)
{
// Check if(TempNode) is CurrentLevel
if (TempNode.Left != null)
{
Queue.Enqueue(TempNode.Left);
QLevels.Enqueue(Level + 1);
}
if (TempNode.Right != null)
{
Queue.Enqueue(TempNode.Right);
QLevels.Enqueue(Level + 1);
}
if (Level + 1 != Result.Count)
{
if (TempNode.Left != null) Result.Last().Add(TempNode.Left);
if (TempNode.Right != null) Result.Last().Add(TempNode.Right);
}
else
{
TempLinkedList = new LinkedList();
if (TempNode.Left != null) TempLinkedList.Add(TempNode.Left);
if (TempNode.Right != null) TempLinkedList.Add(TempNode.Right);
if (TempNode.Right != null || TempNode.Left != null)
Result.Add(TempLinkedList);
}
}
}
return Result;
}
}
// Q5
public static Node Circular(LinkedList List)
{
Node Result = List.Head;
Hashtable hashtable = new Hashtable();
while (Result != null)
{
if (hashtable.Contains(Result))
return Result;
else
{
hashtable.Add(Result, Result.Value);
Result = Result.Next;
}
}
return Result;
}
public LinkedList Reverse(LinkedList List, int K)
{
Node Cursor = this.Head;
for (int i = 1; i < (K-1); i++)
{
while (Cursor.Next != null)
{
Cursor.Next = Cursor.Next.Next;
Cursor.Next = Cursor;
Cursor = Cursor.Next;
}
}
return List;
}
// Q1
public LinkedList RemoveDuplicates(LinkedList List)
{
Node TempHead1 = List.Head;
while (TempHead1 != null)
{
Node TempHead2 = TempHead1;
while (TempHead2.Next != null)
{
if (TempHead1.Value.Equals(TempHead2.Next.Value))
{
//List.Delete(TempHead2.Value);
TempHead2.Next = TempHead2.Next.Next;
}
else
TempHead2 = TempHead2.Next;
}
TempHead1 = TempHead1.Next;
}
return List;
}