A Doubly-Linked List is a linear data structure where each node stores three components: the data, a pointer to the previous node, and a pointer to the next node. Unlike a Linked List, this two-way linkage allows traversal in both directions, making certain operations like deletion or reverse traversal more efficient.
Doubly-linked lists frequently appear in coding interviews because they test your understanding of pointer manipulation, memory management, and edge cases. Candidates are often asked to implement operations such as inserting or deleting nodes, reversing the list, or designing structures like an LRU cache. These problems help interviewers evaluate how well you manage references and maintain data structure integrity.
Common problem patterns include:
Mastering doubly-linked lists builds a deeper understanding of pointer-based data structures and prepares you for advanced design questions commonly asked in technical interviews.
Queues are often implemented using linked structures, making it useful to understand how nodes connect and move in sequence.
Many interview problems combine linked structures with stack-like operations such as push, pop, and backtracking.
Understanding singly linked lists provides the foundation for pointer manipulation and node-based structures used in doubly-linked lists.
Two-pointer techniques help with traversal, reversing, and detecting structural patterns within linked lists.
| Status | Title | Video | Leetcode | Solve | Difficulty | Companies | Topics |
|---|---|---|---|---|---|---|---|
| 146. LRU Cache | Solve | Medium | Accolite+56 | ||||
| 426. Convert Binary Search Tree to Sorted Doubly Linked List | Solve | Medium | Amazon+2 | ||||
| 430. Flatten a Multilevel Doubly Linked List | Solve | Medium | Amazon+3 | ||||
| 1472. Design Browser History | Solve | Medium | Amazon+3 | ||||
| 1797. Design Authentication Manager | Solve | Medium | Twitter | ||||
| 3294. Convert Doubly Linked List to Array II | Solve | Medium | - |
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Frequently appear alongside Doubly Linked List.
Common questions about Doubly Linked List.
A doubly-linked list is a data structure where each node contains a value and two pointers—one to the previous node and one to the next node. This allows traversal in both directions and makes certain insertions and deletions easier.
You should understand insertion, deletion, traversal, and reversal of nodes. Handling edge cases like empty lists, single-node lists, and updating both pointers correctly is critical.
They test your ability to handle pointer manipulation, edge cases, and memory references. Interviewers often use them to evaluate problem-solving skills in data structure design and node operations.
Practicing 10–15 well‑chosen problems is usually enough to understand common patterns. On TalentD, the 11 curated problems help you cover key operations and typical interview scenarios.
Use a doubly-linked list when you need efficient traversal in both directions or frequent deletion of nodes when you already have a reference to them. It’s especially useful in applications like LRU caches and navigation systems.