Apple Coding Interview Questions
Apple problems
Apple interviewers favor straightforward array, string, and tree problems with subtle edge cases. Recursion and linked-list manipulation show up regularly. Code that compiles on the first try and memory-conscious solutions score well — Apple tends to value correctness over exotic algorithms.
Apple Interview Loop Structure
- • Code that compiles and passes edge cases on the first try scores exceptionally well
- • Prioritize memory-conscious and cache-friendly data structures
- • Thoroughly research the specific organization and team domain
4-Week Preparation Strategy for Apple
Action PlanTo maximize your offer probability at Apple, avoid random LeetCode grinding. Follow this structured 4-week roadmap tailored to Apple's specific interview loop and evaluation bar:
Week 1: High-Frequency Patterns
Focus on foundational patterns tested heavily at Apple: 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 Apple's core principles. Review distributed systems fundamentals: caching tiers, partitioning, rate limiting, and database consistency models.
💡 What Apple 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 Apple
Most AskedThese problems appear most frequently in Apple interviews based on reported data.
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Two Sum II - Input Array Is Sorted
#Array
#Two Pointers
#Binary Search | Medium | Solution | ||
| Trapping Rain Water
#Array
#Two Pointers
#Stack | Hard | Solution | ||
| Remove Duplicates from Sorted Array
#Array
#Two Pointers | Easy | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Product of Array Except Self
#Array
#Prefix Product | Medium | Solution | ||
| Running Sum of 1D Array
#Array
#Prefix Sum | Easy | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Two Sum
#Array
#Hash Map | Easy | Solution | ||
| Valid Anagram
#String
#Hash Map
#Sorting | Easy | Solution | ||
| Contains Duplicate
#Array
#Hash Table
#Sorting | Easy | Solution | ||
| LRU Cache
#Hash Table
#Linked List
#Design | Medium | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Kth Largest Element in an Array
#Array
#Heap
#Sorting | Medium | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Reverse Linked List
#Linked List
#Recursion | Easy | Solution | ||
| Merge Two Sorted Lists
#Linked List
#Recursion | Easy | Solution | ||
| Add Two Numbers
#Linked List
#Math
#Recursion | Medium | Solution | ||
| Remove Nth Node From End of List
#Linked List
#Two Pointers | Medium | Solution | ||
| Palindrome Linked List
#Linked List
#Two Pointers
#Stack | Easy | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Invert Binary Tree
#Tree
#DFS
#BFS | Easy | Solution | ||
| Binary Tree Maximum Path Sum
#Tree
#DFS
#DP | Hard | Solution | ||
| Sum Root to Leaf Numbers
#Tree
#DFS
#BFS | Medium | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Climbing Stairs
#DP
#Math
#Memoization | Easy | Solution | ||
| Unique Paths
#Math
#DP
#Combinatorics | Medium | Solution | ||
| Maximum Subarray
#Array
#DP
#Divide and Conquer | Medium | Solution | ||
| Partition Equal Subset Sum
#Array
#Dynamic Programming | Medium | Solution | ||
| Best Time to Buy and Sell Stock
#Array
#Dynamic Programming | Easy | Solution | ||
| Triangle
#Array
#Dynamic Programming | Medium | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Next Greater Element I
#Array
#Hash Map
#Stack | Easy | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Single Number
#Array
#Bit Manipulation | Easy | Solution | ||
| Number of 1 Bits
#Divide and Conquer
#Bit Manipulation | Easy | Solution | ||
| Reverse Bits
#Divide and Conquer
#Bit Manipulation | Easy | Solution | ||
| Power of Two
#Math
#Bit Manipulation
#Recursion | Easy | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Rotate Image
#Array
#Matrix
#Math | Medium | Solution | ||
| Spiral Matrix
#Array
#Matrix
#Simulation | Medium | Solution | ||
| Set Matrix Zeroes
#Array
#Matrix | Medium | Solution | ||
| Maximal Square
#Array
#Dynamic Programming
#Matrix | Medium | Solution | ||
| Search a 2D Matrix II
#Array
#Binary Search
#Divide and Conquer | Medium | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Median of Two Sorted Arrays
#Array
#Binary Search
#Divide and Conquer | Hard | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Letter Combinations of a Phone Number
#Hash Table
#String
#Backtracking | Medium | Solution |
| Problem | Difficulty | Solution | Link | |
|---|---|---|---|---|
| Basic Calculator II
#Math
#String
#Stack | Medium | Solution |