Bidirectional Dynamic Structure • Doubly Linked Chain

Doubly Linked List Visualization

A bidirectional linked data structure where each node contains two pointer addresses: one linking to the previous node (Prev) and one linking to the subsequent node (Next).

Abstract Data Type Properties

Bidirectional pointers enable both forward and backward traversal throughout the sequence. This eliminates the need to traverse from the head when deleting a node whose reference is already known, achieving true O(1) removal.

Traversal
Bidirectional (Prev ↔ Next)
Node Structure
Prev | Value | Next
Delete Given Node
O(1) Constant Time

Operations Panel

1. List Limit & Reset
2. Input Parameters
3. Insertions & Deletions
4. Search, Traversal & Updates
Bidirectional Memory Nodes (Prev ↔ Next)
List is empty

Educational Reference

Bidirectional Linking Mechanism

Each node holds two address pointers (prev and next). head.prev and tail.next point to NULL.

Pointer Inversion in Reversal

Reversing the list requires swapping the prev and next pointer references on every node and exchanging head with tail.

Constant-Time Deletion

Given direct reference to node N, unlinking requires simply N.prev.next = N.next and N.next.prev = N.prev.

Memory Footprint Consideration

Doubly linked lists require two pointer fields per node (double the pointer overhead of singly linked lists), balancing capability with memory cost.