•CODING INTERVIEW QUESTIONS
Apple Coding Interview Questions (DSA)
50 DSA problems sourced from real Apple interviews
Apple Coding Interview Questions
| Problem | Difficulty | Tags |
|---|---|---|
| Medium | ArrayHash TableString | |
| Snapshot Array | Medium | ArrayHash TableBinary Search |
| Longest Common Subsequence | Medium | StringDynamic ProgrammingLongest Common Subsequence |
| Medium | ArrayDynamic Programming | |
| Minimum Cost to Hire K Workers | Hard | ArrayGreedySorting |
| Meeting Rooms III | Hard | ArrayHash TableSorting |
| Last Stone Weight II | Medium | ArrayDynamic ProgrammingKnapsack Problem |
| Last Stone Weight | Easy | ArrayHeap (Priority Queue) |
| Subarray Product Less Than K | Medium | ArrayBinary SearchSliding Window |
| Word Ladder | Hard | Hash TableStringBreadth-First Search |
| Medium | Hash TableLinked ListDesign | |
| Medium | ArraySortingQuicksort | |
| Design Hit Counter | Medium | ArrayBinary SearchDesign |
| Easy | ArrayHash Table | |
| Medium | Depth-First SearchBreadth-First SearchGraph Theory | |
| Insert Delete GetRandom O(1) | Medium | ArrayHash TableMath |
| Easy | ArrayDynamic Programming | |
| Longest Common Prefix | Easy | ArrayStringTrie |
| Medium | ArrayTwo PointersSorting | |
| Design Memory Allocator | Medium | ArrayHash TableDesign |
| Time Based Key-Value Store | Medium | Hash TableStringBinary Search |
| Medium | ArrayHash TableUnion-Find | |
| Medium | ArrayHash TableGreedy | |
| Maximum Swap | Medium | MathGreedy |
| Is Graph Bipartite? | Medium | Depth-First SearchBreadth-First SearchUnion-Find |
| Medium | Hash TableStringSliding Window | |
| Valid Parenthesis String | Medium | StringDynamic ProgrammingStack |
| Design Task Manager | Medium | Hash TableDesignHeap (Priority Queue) |
| Medium | ArrayDepth-First SearchBreadth-First Search | |
| Move Zeroes | Easy | ArrayTwo Pointers |
| LFU Cache | Hard | Hash TableLinked ListDesign |
| Hard | Linked ListDivide and ConquerHeap (Priority Queue) | |
| Valid Sudoku | Medium | ArrayHash TableMatrix |
| Medium | Depth-First SearchBreadth-First SearchGraph Theory | |
| Valid Palindrome | Easy | Two PointersString |
| Medium | ArrayHash TableDivide and Conquer | |
| Easy | Linked ListRecursion | |
| Spiral Matrix | Medium | ArrayMatrixSimulation |
| Find First and Last Position of Element in Sorted Array | Medium | ArrayBinary Search |
| Best Time to Buy and Sell Stock II | Medium | ArrayDynamic ProgrammingGreedy |
| Rotate Image | Medium | ArrayMathMatrix |
| Basic Calculator II | Medium | MathStringStack |
| Medium | Two PointersStringDynamic Programming | |
| Hard | ArrayBinary SearchDivide and Conquer | |
| Medium | ArrayHash TablePrefix Sum | |
| Serialize and Deserialize N-ary Tree | Hard | StringTreeDepth-First Search |
| Permutation in String | Medium | Hash TableTwo PointersString |
| Binary Tree Vertical Order Traversal | Medium | Hash TableTreeDepth-First Search |
| Letter Combinations of a Phone Number | Medium | Hash TableStringBacktracking |
| Edit Distance | Medium | StringDynamic Programming |
Difficulty Breakdown
Top Data Structures & Patterns
Frequently Asked Questions
What questions does Apple ask in coding interviews?
Apple coding interviews focus on 0-1 Knapsack, Array, Backtracking, Bidirectional Search, and other data structure problems. We compiled 50 questions from real Apple interviews. The most common topics are 0-1 Knapsack, Array, Backtracking, Bidirectional Search, Binary Search. Filter by topic to see what comes up most often.
How many Apple coding interview questions are there?
InterviewSkool has 50 Apple coding interview questions: 7 Easy, 36 Medium, and 7 Hard. Most Apple interviews focus on Medium-difficulty problems, so prioritize those in your prep.
How should I prepare for Apple coding interviews?
Start with Medium difficulty problems. Group by topic (Array, Tree, DP) to build pattern recognition. Aim to solve 30 to 40 problems before your interview. Then practice under pressure with a mock interview.
Are Apple coding interview questions free?
Yes. All 50 Apple coding interview questions are free to browse with no sign-up required. You can filter by difficulty and topic tags. Start a mock interview with a free credit to practice under real pressure.
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