Doubly-Linked List LeetCode Problems: All 10, With Python Solutions
Every problem in this library that LeetCode tags Doubly-Linked List — 10 in total, 7 of them with a complete Python solution, a worked example and the time and space complexity of the approach.
- 10 problems
- 0 Easy
- 6 Medium
- 4 Hard
How Doubly-Linked List problems are solved
A tag names the subject, not the method. These pattern hubs cover the techniques that actually solve Doubly-Linked List problems — each one explains the approach, gives a Python template and states its complexity.
- Linked List — Rewire pointers in place, with a dummy head and a saved next to keep it safe.
Doubly-Linked List problems by difficulty
Problems with a complete Python solution are listed first, then by ascending problem number.
Medium (6)
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 146 | LRU Cache | Medium | Design, Hash Table, Linked List +1 |
| 430 | Flatten a Multilevel Doubly Linked List | Medium | Depth-First Search, Linked List, Doubly-Linked List |
| 1472 | Design Browser History | Medium | Stack, Design, Array +3 |
| 1797 | Design Authentication Manager | Medium | Design, Hash Table, Linked List +1 |
| 426 | Convert Binary Search Tree to Sorted Doubly Linked ListPremium | Medium | Stack, Tree, Depth-First Search +4 |
| 1756 | Design Most Recently Used QueuePremium | Medium | Design, Array, Linked List +3 |
Hard (4)
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 432 | All O`one Data Structure | Hard | Design, Hash Table, Linked List +1 |
| 460 | LFU Cache | Hard | Design, Hash Table, Linked List +1 |
| 2296 | Design a Text Editor | Hard | Stack, Design, Linked List +3 |
| 716 | Max StackPremium | Hard | Stack, Design, Linked List +2 |
Keep exploring
- Array1,569
- String672
- Hash Table588
- Math485
- Dynamic Programming481
- Sorting392
- Greedy346
- Depth-First Search289
- Binary Search253
- Database249
- Tree225
- Breadth-First Search223
- Matrix216
- Two Pointers201
- Bit Manipulation194
- Binary Tree174
- Heap (Priority Queue)163
- Prefix Sum157
- Stack157
- Simulation144
- Graph138
- Counting126
- Design122
- Sliding Window116
When the Doubly-Linked List problem arrives live
Stealth Interview is a desktop app for macOS and Windows. It reads the coding problem off your screen, returns a working solution with a step-by-step explanation and its time and space complexity, and transcribes what the interviewer is saying — while staying invisible to screen sharing.