LinkedIn Coding Interview Questions
LinkedIn problems
LinkedIn interviews value depth over breadth: fewer problems but many follow-ups that tighten constraints. Arrays, intervals, and hash-map problems dominate. Prepare to iterate your solution toward O(n) or O(log n) and justify each optimization.
LinkedIn Interview Loop Structure
- • Expect interviewers to progressively tighten memory constraints after your first solution
- • Write clean code with explicit abstractions rather than inline spaghetti
- • Master bidirectional BFS for social network path finding
4-Week Preparation Strategy for LinkedIn
Action PlanTo maximize your offer probability at LinkedIn, avoid random LeetCode grinding. Follow this structured 4-week roadmap tailored to LinkedIn's specific interview loop and evaluation bar:
Week 1: High-Frequency Patterns
Focus on foundational patterns tested heavily at LinkedIn: Two Pointers, Sliding Window, and Hash Map frequency tracking. Solve 10–12 Easy/Medium questions and establish code muscle memory without syntax lookups.
Week 2: Advanced Graph & Tree Drills
Master BFS, DFS, Topological Sorting, and Priority Queues (Min/Max Heaps). Practice articulating state transitions and recursion stack depth trade-offs under real-time interviewer pressure.
Week 3: Timed Mock Coding & Complexity
Simulate real 45-minute technical screens. Spend 5 minutes clarifying requirements, 10 minutes discussing brute-force vs optimal trade-offs, 20 minutes coding cleanly, and 10 minutes dry-running boundary test cases.
Week 4: System Architecture & Behavioral STAR
Draft 5 distinct STAR method stories (Situation, Task, Action, Result) mapped to LinkedIn's core principles. Review distributed systems fundamentals: caching tiers, partitioning, rate limiting, and database consistency models.
💡 What LinkedIn Interviewers Evaluate:
Interviewers score candidates across 4 independent pillars: Algorithmic Optimality (arriving at optimal Big-O), Code Craftsmanship (modular functions, clean naming, zero syntax debt), Communication & Thinking Out Loud (proactive collaboration, asking clarifying questions), and Edge Case Rigor (null checks, integer overflows, duplicate inputs).
High Frequency at LinkedIn
Most AskedThese problems appear most frequently in LinkedIn interviews based on reported data.
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Search in Rotated Sorted Array
#Array
#Binary Search | Medium | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Evaluate Reverse Polish Notation
#Array
#Math
#Stack | Medium | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Word Ladder
#Hash Set
#BFS
#String | Hard | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Maximum Depth of Binary Tree
#Tree
#DFS
#BFS | Easy | Solution | ||
| Lowest Common Ancestor of a BST
#Tree
#DFS
#BST | Medium | Solution | ||
| Serialize and Deserialize Binary Tree
#Tree
#DFS
#BFS | Hard | Solution | ||
| Symmetric Tree
#Tree
#DFS
#BFS | Easy | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Number of Connected Components in Undirected Graph
#Graph
#DFS
#Union Find | Medium | Solution | ||
| Graph Valid Tree
#Depth-First Search
#Breadth-First Search
#Union Find | Medium | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Maximum Subarray
#Array
#DP
#Divide and Conquer | Medium | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Permutations
#Array
#Backtracking | Medium | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Insert Interval
#Array | Medium | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Word Pattern
#Hash Table
#String | Easy | Solution | ||
| Isomorphic Strings
#Hash Table
#String | Easy | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| K Closest Points to Origin
#Array
#Math
#Divide and Conquer | Medium | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Game of Life
#Array
#Matrix
#Simulation | Medium | Solution |