Google Coding Interview Questions

We track 2122 coding questions asked at Google, tagged with the algorithms and concepts they test. The most common: Array, String, Hash Table, Dynamic Programming, Math.

Browse all 2122 Google questions →

How many questions involve each concept

Share of all 2122 tracked Google questions that touch each concept. Questions usually involve several, so these overlap.

Where Google differs from the average company

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

Google specialties

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

Difficulty mix

Level split of the 2122 tracked Google questions.

Junior27% (578)
Mid/Senior52% (1097)
Staff21% (447)

Every concept in Google interviews

Concept	Questions	% of questions	Share of mix
Array	1163	54.8%	19.1%
String	481	22.7%	8.9%
Hash Table	448	21.1%	6.1%
Dynamic Programming	368	17.3%	6.4%
Math	364	17.2%	6.9%
Sorting	288	13.6%	3.7%
Greedy	224	10.6%	3.3%
Depth-First Search	200	9.4%	2.4%
Binary Search	199	9.4%	2.7%
Matrix	173	8.2%	2.4%
Breadth-First Search	168	7.9%	2.0%
Two Pointers	153	7.2%	2.3%
Tree	144	6.8%	1.8%
Prefix Sum	143	6.7%	2.1%
Bit Manipulation	142	6.7%	2.3%
Heap (Priority Queue)	124	5.8%	1.4%
Stack	118	5.6%	1.6%
Simulation	116	5.5%	1.9%
Binary Tree	111	5.2%	1.3%
Counting	109	5.1%	1.4%
Sliding Window	102	4.8%	1.4%
Graph Theory	100	4.7%	1.3%
Design	81	3.8%	1.0%
Backtracking	77	3.6%	1.2%
Database	75	3.5%	3.7%
Enumeration	68	3.2%	1.0%
Union-Find	67	3.2%	0.7%
Linked List	63	3.0%	1.3%
Number Theory	49	2.3%	0.6%
Ordered Set	46	2.2%	0.4%
Divide and Conquer	45	2.1%	0.5%
Monotonic Stack	44	2.1%	0.5%
Recursion	37	1.7%	0.6%
Segment Tree	36	1.7%	0.3%
Queue	34	1.6%	0.4%
Trie	33	1.6%	0.4%
Binary Search Tree	29	1.4%	0.3%
Geometry	29	1.4%	0.4%
Memoization	29	1.4%	0.3%
Bitmask	25	1.2%	0.2%
Combinatorics	25	1.2%	0.3%
Topological Sort	21	1.0%	0.2%
Binary Indexed Tree	20	0.9%	0.2%
Hash Function	20	0.9%	0.2%
Shortest Path	20	0.9%	0.2%
String Matching	20	0.9%	0.3%
Game Theory	16	0.8%	0.2%
Monotonic Queue	15	0.7%	0.1%
Brainteaser	13	0.6%	0.2%
Rolling Hash	13	0.6%	0.1%
Data Stream	11	0.5%	0.1%
Randomized	10	0.5%	0.1%
Merge Sort	9	0.4%	0.1%
Doubly-Linked List	8	0.4%	0.1%
Counting Sort	7	0.3%	0.1%
Bucket Sort	6	0.3%	0.0%
Sweep Line	6	0.3%	0.1%
Quickselect	6	0.3%	0.0%
Interactive	5	0.2%	0.1%
Iterator	5	0.2%	0.1%
Concurrency	4	0.2%	0.2%
Probability and Statistics	4	0.2%	0.1%
Reservoir Sampling	4	0.2%	0.0%
Shell	4	0.2%	0.2%
Eulerian Circuit	3	0.1%	0.0%
Minimum Spanning Tree	3	0.1%	0.0%
Radix Sort	2	0.1%	0.0%
Strongly Connected Component	2	0.1%	0.0%
Biconnected Component	1	0.0%	0.0%
Rejection Sampling	1	0.0%	0.0%
Sort	1	0.0%	0.0%
Suffix Array	1	0.0%	0.0%

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