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deletion in circular linked list in DSA

Deletion in Circular linked list

Posted on 23 May 202023 April 2023 By YASH PAL No Comments on Deletion in Circular linked list

To perform deletion in a circular linked list we need to maintain and store the reference of the last node of the list. because using the reference of the last node the deletion operation can be done in constant time.

so in this tutorial, we are going to learn how to

  1. Deletion of the first node in the circular linked list.
  2. Delete the only node of the list.
  3. Delete the last node of the list.
  4. Delete a node at any position in the list.

Delete the first node of the circular linked list.

let’s say we have a list that has four nodes in it.

Deletion in circular linked list data structures

to delete the first node of the list we simply store the second node’s reference into the last node’s link part.

Deletion in circular linked list data structures

so now the first node is deleted from the linked list.

Deletion in circular linked list data structures

Delete the only node

if we have a linked list that has only one node.

Deletion in circular linked list data structures

then to delete this only node we simply store None or Null value into the last variable.

Deletion in circular linked list data structures

so now our list becomes empty.

Deletion in circular linked list data structures

Delete the last node

to delete the last node first we need to find a reference p of the predecessor of the last node.

Deletion in circular linked list data structures

then we store the first node’s reference into the linked part of node p.

Deletion in circular linked list data structures

after that, we update the list variable’s position. because after deletion of the last node now the node p becomes the last node of the list.

Deletion in circular linked list data structures

so now after performing these operations the last node’s is deleted.

Deletion in circular linked list data structures

Delete a node at the kth position

to delete a node at position x. first, we need to find the reference to the predecessor of the node. like we want to delete the third node on the list. then we need to find the reference p of the second node.

Deletion in circular linked list data structures

after that, we store the node’s reference that comes after the node that we want to delete in the linked part of node p.

Deletion in circular linked list data structures

so now the third node’s deleted from the linked list.

Deletion in circular linked list data structures

Computer Science Tutorials, Data Structures Tutorials Tags:computer science, Data Structure

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