Amazon Coding Interview Questions

We track 1831 coding questions asked at Amazon, tagged with the algorithms and concepts they test. The most common: Array, String, Hash Table, Dynamic Programming, Math.

Browse all 1831 Amazon questions →

How many questions involve each concept

Share of all 1831 tracked Amazon questions that touch each concept. Questions usually involve several, so these overlap.

Where Amazon differs from the average company

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

Amazon specialties

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

Difficulty mix

Level split of the 1831 tracked Amazon questions.

Junior27% (499)
Mid/Senior55% (1003)
Staff18% (329)

Every concept in Amazon interviews

Concept	Questions	% of questions	Share of mix
Array	1006	54.9%	19.5%
String	398	21.7%	8.6%
Hash Table	380	20.8%	6.1%
Dynamic Programming	283	15.5%	5.7%
Math	280	15.3%	6.4%
Sorting	275	15.0%	4.1%
Greedy	231	12.6%	3.9%
Depth-First Search	185	10.1%	2.6%
Binary Search	181	9.9%	2.9%
Breadth-First Search	149	8.1%	2.1%
Two Pointers	140	7.6%	2.5%
Matrix	136	7.4%	2.2%
Tree	134	7.3%	1.9%
Prefix Sum	127	6.9%	2.2%
Heap (Priority Queue)	118	6.4%	1.5%
Binary Tree	113	6.2%	1.6%
Stack	107	5.8%	1.8%
Bit Manipulation	106	5.8%	2.2%
Simulation	101	5.5%	1.9%
Sliding Window	91	5.0%	1.5%
Counting	80	4.4%	1.1%
Graph Theory	79	4.3%	1.1%
Database	70	3.8%	4.0%
Design	64	3.5%	0.9%
Linked List	62	3.4%	1.5%
Backtracking	59	3.2%	1.1%
Union-Find	48	2.6%	0.6%
Enumeration	45	2.5%	0.8%
Monotonic Stack	38	2.1%	0.5%
Divide and Conquer	37	2.0%	0.5%
Recursion	36	2.0%	0.7%
Number Theory	34	1.9%	0.5%
Ordered Set	34	1.9%	0.4%
Queue	29	1.6%	0.4%
Binary Search Tree	28	1.5%	0.4%
Trie	26	1.4%	0.4%
Segment Tree	23	1.3%	0.3%
Memoization	21	1.1%	0.3%
Combinatorics	18	1.0%	0.3%
Topological Sort	17	0.9%	0.2%
Geometry	16	0.9%	0.3%
Hash Function	16	0.9%	0.2%
String Matching	16	0.9%	0.3%
Shortest Path	15	0.8%	0.2%
Binary Indexed Tree	14	0.8%	0.2%
Bitmask	13	0.7%	0.1%
Data Stream	12	0.7%	0.1%
Game Theory	12	0.7%	0.2%
Monotonic Queue	11	0.6%	0.1%
Brainteaser	10	0.5%	0.2%
Rolling Hash	10	0.5%	0.1%
Counting Sort	9	0.5%	0.1%
Doubly-Linked List	9	0.5%	0.1%
Merge Sort	7	0.4%	0.1%
Bucket Sort	6	0.3%	0.1%
Randomized	6	0.3%	0.1%
Sweep Line	5	0.3%	0.1%
Interactive	4	0.2%	0.1%
Quickselect	4	0.2%	0.0%
Minimum Spanning Tree	3	0.2%	0.0%
Suffix Array	3	0.2%	0.0%
Eulerian Circuit	2	0.1%	0.0%
Iterator	2	0.1%	0.0%
Probability and Statistics	2	0.1%	0.0%
Radix Sort	2	0.1%	0.0%
Strongly Connected Component	2	0.1%	0.0%
Biconnected Component	1	0.1%	0.0%
Reservoir Sampling	1	0.1%	0.0%
Shell	1	0.1%	0.1%
Sort	1	0.1%	0.0%

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