Coding Interview Questions

Review this list of 490 Coding interview questions and answers verified by hiring managers and candidates.

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Print all possible solutions to the N-Queens problem. Has video answer
2 years ago
Given a set of numbers, find the number in the set that is closest to the mean of the entire set.
8 months ago
Solve a variant of 3Sum.
9 months ago
Given an array of children’s ratings, assign at least one candy to each child so that higher-rated children get more than their neighbors, and return the minimum total candies needed.
a year ago
What are the key concepts and operations associated with trees?
5 years ago
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Implement Markov chain.
3 months ago
Given an unsorted array, find duplicate elements in constant time, without using inbuilt functions of python.
2 years ago1 answer
Apply the quadratic formula to a sorted array such that the resulting array is still sorted.
3 years ago
Simplify Path
10 months ago
Group Shifted Strings
10 months ago
Top K Facebook Posts
6 months ago
Write a function to simulate 25 coin flips with 50/50 probability. Return the number of heads.
Given two dates, return the number of days between them.
2 years ago
Write a query that detects repeated authentication failures from the same IP within a 10-minute window. Then explain how you would determine whether the pattern indicates malicious activity or simple user error.
9 months 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.
a year ago1 answer
Given 2 strings, return the longest common substring.
2 years ago1 answer
Given employee, department, and salary data stored in a dictionary, find the second maximum salary for each department.
5 months ago
Develop a custom data structure with O(1) time complexity for get() and setall() operations.
2 years ago
Convert Biased Coin to Fair Coin
a year ago
Explain polymorphism.
2 years ago

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Coding Interview Questions

Print all possible solutions to the N-Queens problem. Has video answer

Given a set of numbers, find the number in the set that is closest to the mean of the entire set.

Solve a variant of 3Sum.

Given an array of children’s ratings, assign at least one candy to each child so that higher-rated children get more than their neighbors, and return the minimum total candies needed.

What are the key concepts and operations associated with trees?

Implement Markov chain.

Given an unsorted array, find duplicate elements in constant time, without using inbuilt functions of python.

Apply the quadratic formula to a sorted array such that the resulting array is still sorted.

Simplify Path

Group Shifted Strings

Top K Facebook Posts

Write a function to simulate 25 coin flips with 50/50 probability. Return the number of heads.

Given two dates, return the number of days between them.

Write a query that detects repeated authentication failures from the same IP within a 10-minute window. Then explain how you would determine whether the pattern indicates malicious activity or simple user error.

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 2 strings, return the longest common substring.

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

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

Convert Biased Coin to Fair Coin

Explain polymorphism.

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