Data Structures & Algorithms Interview Questions

Review this list of 336 Data Structures & Algorithms interview questions and answers verified by hiring managers and candidates.

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Serialize and deserialize binary tree
2 years ago
Implement x to the power of n without using any built-in library.
7 months ago
How would you implement a child-parent relation for finding the Least Common Ancestor (LCA) without using pointers?
2 years ago2 answers
Given a stream of Uber ride requests, compute the number of ride requests in every 15-minute window.
5 months ago
Merge two lists where one has empty spaces at the end.
8 months ago
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Find the distance between two points in 3D space.
3 years ago
Construct a binary tree from an ancestor matrix.
5 years ago1 answer
How would you efficiently sum up a massive number of integers?
2 years ago1 answer
Write a program to count the frequency of each character in a given text file.
7 years ago1 answer
Implement a string sorting algorithm, treating digits as numbers.
5 years ago1 answer
Abbreviate an array of strings.
3 years ago
Explain the filter function.
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
3 sum
2 years ago
Maximum Path Quality of a Graph
6 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
Given a string of digits from 2 to 9 and the classic phone keypad mapping, return all possible letter combinations the number could represent.
7 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

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Data Structures & Algorithms Interview Questions

Serialize and deserialize binary tree

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

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

Given a stream of Uber ride requests, compute the number of ride requests in every 15-minute window.

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

Find the distance between two points in 3D space.

Construct a binary tree from an ancestor matrix.

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

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

Implement a string sorting algorithm, treating digits as numbers.

Abbreviate an array of strings.

Explain the filter function.

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

What are the key concepts and operations associated with trees?

3 sum

Maximum Path Quality of a Graph

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.

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

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.

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