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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Number Finder
3 years ago30 answers
Generate Parentheses Has video answer
+34 months ago15 answers
Design an algorithm to predict the next word or phrase one is typing on a phone.
a year ago
Given an integer, reverse it. Integers are within range [-2^15, 2^15 - 1].
a year ago1 answer
Given the head of two singly linked lists, write a function to return the point where they intersect (if any).
+22 years ago
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Calculate the average distance between cities.
5 years ago10 answers
Koko eating bananas.
3 years ago2 answers
How would you sort a bitonic array efficiently?
6 months ago1 answer
Sort a nearly sorted (or K sorted) array.
a year ago1 answer
Build a Calculator
+22 years ago5 answers
Given the root of a binary tree of integers, return the maximum path sum. Has video answer
+22 years ago2 answers
Given an array of integers, find the next greater integer for each element in the array.
a year ago
Rotating the Box
2 years ago
Design a task scheduler in Python.
a month ago9 answers
Implement a circular buffer.
2 years ago4 answers
Find the maximum subarray sum.
+124 months ago34 answers
Given a list of strings, find all strings that encode to the same value using a Caesar Cipher. (A Caesar Cipher rotates characters, e.g. in CC3: a->d, b->e, ..., z->c)
8 months ago1 answer
Construct a binary tree given its preorder and inorder traversals.
+26 months ago11 answers
Given an array of task durations (in minutes), return the pairs of tasks that can be completed within 60 minutes. For example, for [1, 43, 20, 59, 30, 30], return [[0, 3], [4, 5]].
2 years ago2 answers
How do you split a machine learning dataset for training, evaluation, and testing? Has video answer
5 years ago3 answers

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Data Structures & Algorithms Interview Questions

Number Finder

Generate Parentheses Has video answer

Design an algorithm to predict the next word or phrase one is typing on a phone.

Given an integer, reverse it. Integers are within range [-2^15, 2^15 - 1].

Given the head of two singly linked lists, write a function to return the point where they intersect (if any).

Calculate the average distance between cities.

Koko eating bananas.

How would you sort a bitonic array efficiently?

Sort a nearly sorted (or K sorted) array.

Build a Calculator

Given the root of a binary tree of integers, return the maximum path sum. Has video answer

Given an array of integers, find the next greater integer for each element in the array.

Rotating the Box

Design a task scheduler in Python.

Implement a circular buffer.

Find the maximum subarray sum.

Given a list of strings, find all strings that encode to the same value using a Caesar Cipher. (A Caesar Cipher rotates characters, e.g. in CC3: a->d, b->e, ..., z->c)

Construct a binary tree given its preorder and inorder traversals.

Given an array of task durations (in minutes), return the pairs of tasks that can be completed within 60 minutes. For example, for [1, 43, 20, 59, 30, 30], return [[0, 3], [4, 5]].

How do you split a machine learning dataset for training, evaluation, and testing? Has video answer

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