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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Find the Smallest Missing Integer
3 years ago19 answers
Merge two sorted lists
+38 months ago6 answers
Count the number of ways to split a string.
3 years ago2 answers
Roman to Integer
+12 years ago
Given a string, return the number of vowel substrings ('a', 'e', 'i', 'o', 'u') that include all five vowels.
3 years ago4 answers
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Given two strings of equal length, determine if it's possible to form a palindrome by cutting them in half.
3 years ago2 answers
Count items within compartments between specific indices of an array.
2 years ago1 answer
Clone a graph.
2 years ago
Sort a doubly linked list using merge sort. Has video answer
8 months ago8 answers
Given a train schedule with departure city, arrival city, start time, end time, and duration, and given a source and destination, find the sequence of trains that gets you there at the earliest possible time.
6 months ago
Sort Colors
+12 years ago
Find the minimum window substring. Has video answer
+37 months ago4 answers
Find the Largest Smaller BST Key
3 years ago17 answers
Design an indexer and a retriever
2 years ago1 answer
Given a string with parentheses, write a function that removes the minimum number of characters to balance the parentheses.
2 years ago1 answer
Find the closest number in a sorted array.
3 years ago2 answers
Merge two sorted linked list
+12 months ago
Vertical Traversal of a Binary Tree
a year ago1 answer
Implement regular expression matching for a string and pattern, where . matches any single character and * matches zero or more of the preceding element.
8 months ago1 answer
If the data set is too large to fit in memory on one machine and you have multiple workers, how would you sort it?
6 months ago

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Data Structures & Algorithms Interview Questions

Find the Smallest Missing Integer

Merge two sorted lists

Count the number of ways to split a string.

Roman to Integer

Given a string, return the number of vowel substrings ('a', 'e', 'i', 'o', 'u') that include all five vowels.

Given two strings of equal length, determine if it's possible to form a palindrome by cutting them in half.

Count items within compartments between specific indices of an array.

Clone a graph.

Sort a doubly linked list using merge sort. Has video answer

Given a train schedule with departure city, arrival city, start time, end time, and duration, and given a source and destination, find the sequence of trains that gets you there at the earliest possible time.

Sort Colors

Find the minimum window substring. Has video answer

Find the Largest Smaller BST Key

Design an indexer and a retriever

Given a string with parentheses, write a function that removes the minimum number of characters to balance the parentheses.

Find the closest number in a sorted array.

Merge two sorted linked list

Vertical Traversal of a Binary Tree

Implement regular expression matching for a string and pattern, where . matches any single character and * matches zero or more of the preceding element.

If the data set is too large to fit in memory on one machine and you have multiple workers, how would you sort it?

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