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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Given a binary array where an operation cycles a row's elements to the left or right, return the minimum number of operations needed to create a column of 1s. If not possible, return 0.
2 years ago1 answer
Build a Basic Regex Parser
2 years ago2 answers
Find the first repeated character in a given string.
2 years ago3 answers
Traverse a matrix or grid to find the shortest path between point A and point B.
7 months ago
Implement regular expression matching for a string and pattern, where . matches any single character and * matches zero or more of the preceding element.
6 months ago
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Given an array 'nums' with n distinct numbers in the range [0, n], return the only number in the range that is missing from the array.
2 years ago2 answers
Write a function to check whether a string contains a substring.
2 years ago1 answer
You are given m*n matrix, find if any row, column or diagonal has all boolean = True. Find for diagonals and anti diagonals at 45 degrees
a year ago
Given two strings (Word 1 and Word 2) and a list of valid words from a dictionary, return the minimum number of operations required to convert Word 1 to Word 2.
4 years ago11 answers
If given two strings, each containing a number larger than 32-bit, how do you add them and return the result as a string?
5 years ago1 answer
Return all unique substrings of a given string.
4 months ago
01 Matrix
2 years ago1 answer
Transform a flat array of objects into a nested list.
2 years ago1 answer
Given an array of integers, print all subarrays that sum to zero.
5 years ago2 answers
Find the minimum total cost to supply water to all the houses in a village. Has video answer
Given an organizational hierarchy, how would you model it so I can quickly find a person's direct reports and everyone under their department?
8 months ago
Design the ad management logic for surfacing ads based on user preferences or profiles.
7 months ago
Given an array of strings, return groups of "buddy strings," where the strings have the same length and the distance between corresponding characters is the same.
6 months ago
Explain how to design and implement a password checker based on specific requirements.
5 years ago2 answers
Explain the sort function.
3 years ago3 answers

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Data Structures & Algorithms Interview Questions

Given a binary array where an operation cycles a row's elements to the left or right, return the minimum number of operations needed to create a column of 1s. If not possible, return 0.

Build a Basic Regex Parser

Find the first repeated character in a given string.

Traverse a matrix or grid to find the shortest path between point A and point B.

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

Given an array 'nums' with n distinct numbers in the range [0, n], return the only number in the range that is missing from the array.

Write a function to check whether a string contains a substring.

You are given m*n matrix, find if any row, column or diagonal has all boolean = True. Find for diagonals and anti diagonals at 45 degrees

Given two strings (Word 1 and Word 2) and a list of valid words from a dictionary, return the minimum number of operations required to convert Word 1 to Word 2.

If given two strings, each containing a number larger than 32-bit, how do you add them and return the result as a string?

Return all unique substrings of a given string.

01 Matrix

Transform a flat array of objects into a nested list.

Given an array of integers, print all subarrays that sum to zero.

Find the minimum total cost to supply water to all the houses in a village. Has video answer

Given an organizational hierarchy, how would you model it so I can quickly find a person's direct reports and everyone under their department?

Design the ad management logic for surfacing ads based on user preferences or profiles.

Given an array of strings, return groups of "buddy strings," where the strings have the same length and the distance between corresponding characters is the same.

Explain how to design and implement a password checker based on specific requirements.

Explain the sort function.

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