Coding Interview Questions

Study our database of real interview questions and answers verified by hiring managers and candidates.

638 questions
547 companies
27 roles
Last updated Nov 2026

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Solve a variant of 3Sum.
a year ago
Implement an in-place merge of two sorted arrays.
a year ago
Given a graph with N nodes and M edges, identify its network topology. Return 1 for Bus (linear chain), 2 for Star (one central node), 3 for Ring (circular), or -1 if none match.
2 years ago1 answer
Given employee, department, and salary data stored in a dictionary, find the second maximum salary for each department.
7 months ago
Top K Facebook Posts
8 months ago
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Develop a custom data structure with O(1) time complexity for get() and setall() operations.
2 years ago
Closest Subarray Sum to Target.
a year ago
Convert Biased Coin to Fair Coin
a year ago
Explain polymorphism.
2 years ago
Check if two lines are parallel.
4 months ago
Is it possible for a subclass in Python to inherit from multiple base classes?
How would you write a test for a coin flip function?
Given a large set of CSV files with thousands of paragraphs each, how would you detect duplicates within each file, and how would you scale this solution for many files?
2 years ago1 answer
Handle Missing Data
Code a single-producer, multiple-consumer ring buffer.
+110 months ago
Design a puzzle-piece class, then an assemble function that takes a list of pieces.
10 months ago
Build a simplified Tetris engine: pieces drop according to an input sequence, and blocks above a cleared line do not fall into gaps below. Return the height of the tallest column at the end.
3 years ago
Implement a thread-safe LRU cache in C++.
3 years ago
Given daily prices and an integer k, find the maximum profit from at most k buy-then-sell transactions, then cut the extra memory as far as you can.
3 days ago
Reorder a list so equal values sit together and groups appear in the order their value first occurs: input 1, 5, 1, 1, 3, 7, 5 gives 1, 1, 1, 5, 5, 3, 7.
3 days ago

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Coding Interview Questions

Solve a variant of 3Sum.

Implement an in-place merge of two sorted arrays.

Given a graph with N nodes and M edges, identify its network topology. Return 1 for Bus (linear chain), 2 for Star (one central node), 3 for Ring (circular), or -1 if none match.

Given employee, department, and salary data stored in a dictionary, find the second maximum salary for each department.

Top K Facebook Posts

Develop a custom data structure with O(1) time complexity for get() and setall() operations.

Closest Subarray Sum to Target.

Convert Biased Coin to Fair Coin

Explain polymorphism.

Check if two lines are parallel.

Is it possible for a subclass in Python to inherit from multiple base classes?

How would you write a test for a coin flip function?

Given a large set of CSV files with thousands of paragraphs each, how would you detect duplicates within each file, and how would you scale this solution for many files?

Handle Missing Data

Code a single-producer, multiple-consumer ring buffer.

Design a puzzle-piece class, then an assemble function that takes a list of pieces.

Build a simplified Tetris engine: pieces drop according to an input sequence, and blocks above a cleared line do not fall into gaps below. Return the height of the tallest column at the end.

Implement a thread-safe LRU cache in C++.

Given daily prices and an integer k, find the maximum profit from at most k buy-then-sell transactions, then cut the extra memory as far as you can.

Reorder a list so equal values sit together and groups appear in the order their value first occurs: input 1, 5, 1, 1, 3, 7, 5 gives 1, 1, 1, 5, 5, 3, 7.

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