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Rotate linked list clockwise by k nodes in scala

Rotating linked list node clockwise

Scala program for Rotate linked list clockwise by k nodes. Here more solutions.

/*
  Scala program for 
  Rotate a list by moving each element 
  k times to the right.
  Or clockwise rotation of linked list 
*/
// Linked list node
class LinkNode(var data: Int,
	var next: LinkNode)
{
	def this(data: Int)
	{
		this(data, null);
	}
}
class SingleLL(var head: LinkNode,
	var tail: LinkNode)
{
	def this()
	{
		this(null, null);
	}
	// Add new Node at end of linked list 
	def addNode(data: Int): Unit = {
		var node: LinkNode = new LinkNode(data);
		if (this.head == null)
		{
			this.head = node;
		}
		else
		{
			// Append the node at last position
			this.tail.next = node;
		}
		this.tail = node;
	}
	// Display linked list element
	def display(): Unit = {
		if (this.head == null)
		{
			println("\n Empty linked list");
			return;
		}
		var temp: LinkNode = this.head;
		// iterating linked list elements
		while (temp != null)
		{
			print(" " + temp.data + " →");
			// Visit to next node
			temp = temp.next;
		}
		println(" NULL");
	}
	// This are perform the linked list rotation
	def rotation(k: Int): Unit = {
		// Define some auxiliary variable
		var auxiliary: LinkNode = this.head;
		var count: Int = 0;
		// Count number of node in linked list
		while (auxiliary != null)
		{
			// visit to next node
			auxiliary = auxiliary.next;
			count += 1;
		}
		if (count <= 1)
		{
			// When have less than 2 nodes in linked list
			return;
		}
		// Get actual rotation
		count = k % count;
		if (count == 0)
		{
			// When actual linked list are not affected
			return;
		}
		auxiliary = this.head;
		// Find the rotational node
		while (count > 1)
		{
			// Visit to next node
			auxiliary = auxiliary.next;
			count -= 1;
		}
		// Connecting the last node to first node of linked list
		this.tail.next = this.head;
		// Set new last node
		this.tail = auxiliary;
		// Set new head
		this.head = auxiliary.next;
		// Set that there is no node after of tail
		this.tail.next = null;
	}
	// Handles the request to perform rotation
	// k is indicate node rotation
	def clockwiseRotation(k: Int): Unit = {
		if (k <= 0)
		{
			// When invalid given k
			return;
		}
		if (this.head == null)
		{
			println("\n Empty Linked List");
			return;
		}
		// Display given linked list
		println(" Before rotate ");
		println(" Linked List : ");
		display();
		println(" Given k : " + k);
		// Perform rotation
		rotation(k);
		// Display resultant linked list
		println(" After rotate ");
		println(" Linked List : ");
		display();
		println("\n");
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var sll1: SingleLL = new SingleLL();
		var sll2: SingleLL = new SingleLL();
		// First linked list
		// 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 → NULL
		sll1.addNode(1);
		sll1.addNode(2);
		sll1.addNode(3);
		sll1.addNode(4);
		sll1.addNode(5);
		sll1.addNode(6);
		sll1.addNode(7);
		sll1.addNode(8);
		// Second linked list
		// 4 → 9 → 7 → 3 → 8 → 6 → -2 → NULL
		sll2.addNode(4);
		sll2.addNode(9);
		sll2.addNode(7);
		sll2.addNode(3);
		sll2.addNode(8);
		sll2.addNode(6);
		sll2.addNode(-2);
		// Test case
		sll1.clockwiseRotation(3);
		sll2.clockwiseRotation(18);
	}
}

Output

 Before rotate
 Linked List :
 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 → NULL
 Given k : 3
 After rotate
 Linked List :
 4 → 5 → 6 → 7 → 8 → 1 → 2 → 3 → NULL


 Before rotate
 Linked List :
 4 → 9 → 7 → 3 → 8 → 6 → -2 → NULL
 Given k : 18
 After rotate
 Linked List :
 8 → 6 → -2 → 4 → 9 → 7 → 3 → NULL





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