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Coding Interview Questions

Review this list of 458 Coding interview questions and answers verified by hiring managers and candidates.

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Find the longest common prefix given two integer arrays.
9 months ago2 answers
Reorder linked list.
8 months ago
Group anagrams
+102 years ago2 answers
Implement an in-memory database in CodeSignal, with each round adding more functionality.
9 months ago
Given profiler samples from running code, find the slowest part in the code.
7 months ago
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Reverse a Sentence
+32 years ago34 answers
Given a matrix with a rat, bread, cat, and obstacles, find a path from the rat to the bread that maximizes the minimum distance from cat.
a year ago3 answers
Given a sorted array of integers (which may include negatives), return the squares of the numbers in sorted order. As a follow-up, find the k-th smallest squared value.
7 months ago6 answers
What percentage of users who were active on Messenger yesterday made a video call yesterday?
2 years ago4 answers
Merge Intervals Has video answer
+114 months ago58 answers
Write a program that scans the file system to identify and report duplicate files, handling real files, extensions, and file reading operations.
2 months ago
Implement a GPU credit management system.
a month ago
Implement a function to traverse cell dependencies in an Excel-like spreadsheet and detect circular references between cells.
7 months ago
Top Salaries by Department
4 months ago35 answers
Write a function that converts stack samples into a trace, given example inputs and outputs, in a Google Colab environment.
a month ago
Write a query to find the top 3 unique salaries in each department and list all employees who have those salaries.
a year ago6 answers
Given a bookstore database schema, write SQL queries using joins and aggregations to answer questions about sales, inventory, and customer data.
a year ago1 answer
Detect circular dependencies between fields in the CSV data.
3 months ago
Explain how to find a target sum in an array. Has video answer
2 years ago10 answers
How would you store a list of numbers as a single number? Has video answer
4 years ago14 answers

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