Apple Coding Interview Questions

We track 302 coding questions asked at Apple, tagged with the algorithms and concepts they test. The most common: Array, String, Hash Table, Dynamic Programming, Two Pointers.

Browse all 302 Apple questions →

How many questions involve each concept

Share of all 302 tracked Apple questions that touch each concept. Questions usually involve several, so these overlap.

Where Apple differs from the average company

Concept weight at Apple relative to the average across all companies we track. Green means Apple leans on it harder than most.

Apple specialties

Concepts that show up at Apple but are rarely asked elsewhere. They are easy to get blindsided by.

Difficulty mix

Level split of the 302 tracked Apple questions.

Junior26% (78)
Mid/Senior59% (179)
Staff15% (45)

Every concept in Apple interviews

Concept	Questions	% of questions	Share of mix
Array	154	51.0%	18.1%
String	72	23.8%	10.1%
Hash Table	64	21.2%	6.3%
Dynamic Programming	41	13.6%	5.3%
Two Pointers	37	12.3%	4.8%
Math	34	11.3%	4.4%
Sorting	33	10.9%	2.9%
Depth-First Search	32	10.6%	2.7%
Binary Search	31	10.3%	3.6%
Breadth-First Search	30	9.9%	2.7%
Matrix	29	9.6%	3.0%
Design	28	9.3%	2.6%
Linked List	25	8.3%	3.9%
Stack	25	8.3%	2.9%
Tree	21	7.0%	1.8%
Binary Tree	20	6.6%	1.8%
Heap (Priority Queue)	18	6.0%	1.2%
Divide and Conquer	17	5.6%	1.4%
Backtracking	15	5.0%	1.7%
Greedy	15	5.0%	1.8%
Recursion	13	4.3%	1.7%
Simulation	13	4.3%	1.4%
Sliding Window	13	4.3%	1.3%
Counting	12	4.0%	1.1%
Bit Manipulation	11	3.6%	1.3%
Prefix Sum	11	3.6%	1.2%
Graph Theory	10	3.3%	0.8%
Queue	8	2.6%	0.7%
Monotonic Stack	7	2.3%	0.7%
Trie	7	2.3%	0.6%
Ordered Set	6	2.0%	0.5%
Union-Find	6	2.0%	0.5%
Binary Search Tree	5	1.7%	0.4%
Memoization	5	1.7%	0.4%
Data Stream	4	1.3%	0.3%
Doubly-Linked List	4	1.3%	0.3%
Bucket Sort	3	1.0%	0.1%
Enumeration	3	1.0%	0.3%
Iterator	3	1.0%	0.2%
Merge Sort	3	1.0%	0.2%
Quickselect	3	1.0%	0.2%
Segment Tree	3	1.0%	0.2%
Topological Sort	3	1.0%	0.2%
Binary Indexed Tree	2	0.7%	0.1%
Counting Sort	2	0.7%	0.2%
Database	2	0.7%	0.7%
Geometry	2	0.7%	0.1%
Hash Function	2	0.7%	0.2%
Interactive	2	0.7%	0.3%
Sweep Line	2	0.7%	0.2%
Monotonic Queue	2	0.7%	0.1%
Randomized	2	0.7%	0.1%
Shortest Path	2	0.7%	0.1%
Bitmask	1	0.3%	0.1%
Eulerian Circuit	1	0.3%	0.1%
Game Theory	1	0.3%	0.1%
Number Theory	1	0.3%	0.1%
Radix Sort	1	0.3%	0.0%
String Matching	1	0.3%	0.1%

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