Data Structures & Algorithms Interview Questions

Review this list of 301 Data Structures & Algorithms interview questions and answers verified by hiring managers and candidates.

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How would you efficiently sum up a massive number of integers?
2 years ago1 answer
How would you implement a child-parent relation for finding the Least Common Ancestor (LCA) without using pointers?
2 years ago2 answers
Construct a binary tree from an ancestor matrix.
5 years ago1 answer
Find the distance between two points in 3D space.
3 years ago
Write a program to count the frequency of each character in a given text file.
7 years ago1 answer
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Explain the filter function.
3 years ago1 answer
Abbreviate an array of strings.
3 years ago
Implement a string sorting algorithm, treating digits as numbers.
4 years ago1 answer
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.
10 months ago
Print all possible solutions to the N-Queens problem. Has video answer
2 years 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
What are the key concepts and operations associated with trees?
5 years ago
Given two dates, return the number of days between them.
2 years 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
What are the issues that using hashmap on a multithreaded environment may cause? How would you deal with them?
1 answer
Given 2 strings, return the longest common substring.
2 years ago1 answer
Closest Subarray Sum to Target.
a year ago
Implement an in-place merge of two sorted arrays.
a year ago
Check if two lines are parallel.
3 years ago

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Data Structures & Algorithms Interview Questions

How would you efficiently sum up a massive number of integers?

How would you implement a child-parent relation for finding the Least Common Ancestor (LCA) without using pointers?

Construct a binary tree from an ancestor matrix.

Find the distance between two points in 3D space.

Write a program to count the frequency of each character in a given text file.

Explain the filter function.

Abbreviate an array of strings.

Implement a string sorting algorithm, treating digits as numbers.

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.

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

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.

What are the key concepts and operations associated with trees?

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

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.

What are the issues that using hashmap on a multithreaded environment may cause? How would you deal with them?

Given 2 strings, return the longest common substring.

Closest Subarray Sum to Target.

Implement an in-place merge of two sorted arrays.

Check if two lines are parallel.

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