Data Structures & Algorithms Interview Questions

Review this list of 347 Data Structures & Algorithms interview questions and answers verified by hiring managers and candidates.

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+12a month ago14 answers
Given a sorted array of integers (which may include negatives), return the squares of the numbers in sorted order. As a follow-up, find the k-th smallest squared value.
10 months ago6 answers
Given stock prices for the next n days, how can you maximize your profit by buying or selling one share per day? Has video answer
+132 months ago26 answers
Given a list of bounding boxes and annotations, write a function to compute Intersection over Union.
2 months ago
Detect circular dependencies between fields in the CSV data.
6 months ago
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Product of Array Except Self Has video answer
+34 months ago79 answers
Most Common Words
6 months ago39 answers
Write a function to balance parentheses in a given string by removing the fewest characters possible. Ensure that each opening parenthesis has a corresponding closing parenthesis and each pair is properly nested.
2 years ago5 answers
Given a list of items with different sizes, write an algorithm to pack these items into the minimum number of batches without exceeding the capacity of each batch.
2 years ago1 answer
Given an array of integers, return the pairs with the minimum absolute difference between them.
a year ago2 answers
Find peak element in an array
a year ago2 answers
Find the Duplicates
+17 months ago44 answers
Climbing Stairs
+44 months ago25 answers
Given two trees, determine if the pre-order traversals of two trees are same or not.
a year ago
Print the top view of nodes in a binary tree.
a year ago6 answers
Lexicographic Grid Travel.
a year ago2 answers
Cycle Detection in Package Manager.
10 months ago2 answers
Given a binary tree, check if each node is the average of all descendants
a year ago2 answers
Given the root of a binary tree, return the length of the diameter of the tree.
+13 months ago18 answers
Given an array of integers and a number N, find the length of the longest contiguous subarray such that the difference between any two elements in the subarray is less than N.
10 months ago3 answers

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Data Structures & Algorithms Interview Questions

Course Schedule

Given a sorted array of integers (which may include negatives), return the squares of the numbers in sorted order. As a follow-up, find the k-th smallest squared value.

Given stock prices for the next n days, how can you maximize your profit by buying or selling one share per day? Has video answer

Given a list of bounding boxes and annotations, write a function to compute Intersection over Union.

Detect circular dependencies between fields in the CSV data.

Product of Array Except Self Has video answer

Most Common Words

Write a function to balance parentheses in a given string by removing the fewest characters possible. Ensure that each opening parenthesis has a corresponding closing parenthesis and each pair is properly nested.

Given a list of items with different sizes, write an algorithm to pack these items into the minimum number of batches without exceeding the capacity of each batch.

Given an array of integers, return the pairs with the minimum absolute difference between them.

Find peak element in an array

Find the Duplicates

Climbing Stairs

Given two trees, determine if the pre-order traversals of two trees are same or not.

Print the top view of nodes in a binary tree.

Lexicographic Grid Travel.

Cycle Detection in Package Manager.

Given a binary tree, check if each node is the average of all descendants

Given the root of a binary tree, return the length of the diameter of the tree.

Given an array of integers and a number N, find the length of the longest contiguous subarray such that the difference between any two elements in the subarray is less than N.

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