Coding Interview Questions

Review this list of 515 Coding interview questions and answers verified by hiring managers and candidates.

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Solve a Rummy Deck (12-card hand).
3 years ago1 answer
Print all possible solutions to the N-Queens problem. Has video answer
2 years ago
What are the key concepts and operations associated with trees?
5 years 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
Merge two lists where one has empty spaces at the end.
9 months ago
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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
Group Shifted Strings
a year ago
Implement x to the power of n without using any built-in library.
8 months ago
Given two dates, return the number of days between them.
2 years ago
Write a function to simulate 25 coin flips with 50/50 probability. Return the number of heads.
Given a set of numbers, find the number in the set that is closest to the mean of the entire set.
9 months ago
Solve a variant of 3Sum.
10 months 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.
10 months ago
Implement Pascal's Triangle.
3 years ago
Given 2 strings, return the longest common substring.
2 years ago1 answer
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 a string of digits from 2 to 9 and the classic phone keypad mapping, return all possible letter combinations the number could represent.
8 months ago
3 sum
2 years ago
Implement an in-place merge of two sorted arrays.
a year ago

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Coding Interview Questions

Solve a Rummy Deck (12-card hand).

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

What are the key concepts and operations associated with trees?

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.

Merge two lists where one has empty spaces at the end.

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.

Group Shifted Strings

Implement x to the power of n without using any built-in library.

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

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

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.

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.

Implement Pascal's Triangle.

Given 2 strings, return the longest common substring.

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 a string of digits from 2 to 9 and the classic phone keypad mapping, return all possible letter combinations the number could represent.

3 sum

Implement an in-place merge of two sorted arrays.

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