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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Find the longest common prefix given two integer arrays.
9 months ago2 answers
Reverse a Sentence
+32 years ago37 answers
Group anagrams
+102 years ago2 answers
Reorder linked list.
8 months ago
Given a matrix with a rat, bread, cat, and obstacles, find a path from the rat to the bread that maximizes the minimum distance from cat.
a year ago3 answers
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Merge Intervals Has video answer
+115 months ago61 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.
7 months ago6 answers
Implement a function to traverse cell dependencies in an Excel-like spreadsheet and detect circular references between cells.
7 months ago
Explain how to find a target sum in an array. Has video answer
2 years ago11 answers
How would you store a list of numbers as a single number? Has video answer
4 years ago14 answers
Implement serialize(root) + deserialize(data) so the same tree comes back
2 months ago
Given nums + window size k, return the max for each sliding window in O(n) time complexity.
2 months ago
Detect circular dependencies between fields in the CSV data.
4 months ago
Valid Parentheses
+112 months ago26 answers
Find peak element in an array
10 months ago2 answers
Given an array of integers, return the pairs with the minimum absolute difference between them.
a year ago2 answers
Move all zeros to the end of an array. Has video answer
+44 months ago74 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.
a year ago1 answer
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.
7 months ago3 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

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Data Structures & Algorithms Interview Questions

Find the longest common prefix given two integer arrays.

Reverse a Sentence

Group anagrams

Reorder linked list.

Given a matrix with a rat, bread, cat, and obstacles, find a path from the rat to the bread that maximizes the minimum distance from cat.

Merge Intervals Has video answer

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.

Implement a function to traverse cell dependencies in an Excel-like spreadsheet and detect circular references between cells.

Explain how to find a target sum in an array. Has video answer

How would you store a list of numbers as a single number? Has video answer

Implement serialize(root) + deserialize(data) so the same tree comes back

Given nums + window size k, return the max for each sliding window in O(n) time complexity.

Detect circular dependencies between fields in the CSV data.

Valid Parentheses

Find peak element in an array

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

Move all zeros to the end of an array. Has video answer

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 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.

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.

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