/// <summary>
/// http://www.geeksforgeeks.org/nth-node-from-the-end-of-a-linked-list/
/// </summary>
/// <param name="node"></param>
/// <param name="n"></param>
/// <returns></returns>
public LinkedListNode FindMthNodeFromEnd(LinkedListNode head, int n)
{
LinkedListNode slow = head;
LinkedListNode fast = head;
int count = 1;
while (count < n)
{
if (fast == null)
{
// n is greater than length of linked list.
return(null);
}
fast = fast.getNext();
count++;
}
while (fast != null)
{
fast = fast.getNext();
slow = slow.getNext();
}
return(slow);
}
public LinkedListNode DeleteNode(LinkedListNode node, int value)
{
if (node == null)
{
return(node);
}
if (node.getData() == value)
{
node = node.getNext();
}
LinkedListNode current;
LinkedListNode prev = new LinkedListNode();
current = node;
while (current != null)
{
if (current.getData() == value)
{
prev.setNext(current.getNext());
}
else
{
prev = current;
}
current = current.getNext();
}
prev.setNext(null);
return(prev);
}
public LinkedListNode FindCenter(LinkedListNode node)
{
LinkedListNode n = null;
n = node;
LinkedListNode slow = node;
LinkedListNode fast = node;
while (node.getNext() != null)
{
slow = node;
node = node.getNext();
fast = node.getNext();
}
return(slow);
}
/// <summary>
///
/// </summary>
/// <param name="data"></param>
public void AddLast(int data)
{
if (head == null)
{
head = new LinkedListNode();
head.setData(data);
head.setNext(null);
}
LinkedListNode toAdd = new LinkedListNode();
toAdd = head;
while (toAdd.getNext() != null)
{
toAdd = toAdd.getNext();
}
toAdd.setData(data);
}
/// <summary>
///
/// </summary>
/// <param name="data"></param>
public void DeleteNode(int data)
{
if (head == null)
{
return;
}
LinkedListNode prev;
LinkedListNode ll = new LinkedListNode();
ll = head;
prev = new LinkedListNode();
while (ll != null)
{
prev = ll;
ll = ll.getNext();
if (ll.getData() == data)
{
prev.setNext(ll.getNext());
break;
}
}
}
