Data Structures & Algorithms Interview Questions

Review this list of 294 Data Structures & Algorithms interview questions and answers verified by hiring managers and candidates.

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Asked at Meta • 2 months ago
Given a list of strings, find the number of occurrences of the second letter of the first word, and return the character and its count.
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Asked at Meta • 5 months ago
Traverse a matrix or grid to find the shortest path between point A and point B.
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Asked at Meta • 2 months ago
Given employee, department, and salary data stored in a dictionary, find the second maximum salary for each department.
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Asked at Meta • 5 months ago
Design the ad management logic for surfacing ads based on user preferences or profiles.
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Asked at Amazon • 4 months ago
Given an array of daily stock returns and at most k deletions, determine the maximum number of contiguous days with the same return value after omitting up to k days.
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Asked at Google • 4 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.
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Asked at Google • 2 months ago
How would you design a LinkedIn-like system that instantly shows whether a profile is a first-, second-, or third-level connection for a user at very large scale?
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Asked at LinkedIn • 2 months ago
Given a string where you can make certain edits, determine whether it can become a palindrome.
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Asked at Anduril • 2 months ago
You're trying to take a photograph of two teams arranged in rows. How would you order them so shorter players are in front and taller players are behind?
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Asked at Meta • 2 months ago
Given a stream of Uber ride requests, compute the number of ride requests in every 15-minute window.
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Asked at Google • 2 months ago
Given two strings and two allowed operations, swapping positions of letters and converting all occurrences of one character to another, can the first string be transformed into the second?
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Asked at Google • 2 months ago
What do you know about algorithms?
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Asked at Google • 2 months ago
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 pos...
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Asked at Microsoft • 2 months ago
Given a binary tree, find the shortest path from the root to a leaf.
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Data Structures & Algorithms Interview Questions

Given a list of strings, find the number of occurrences of the second letter of the first word, and return the character and its count.

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

Given employee, department, and salary data stored in a dictionary, find the second maximum salary for each department.

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

Given an array of daily stock returns and at most k deletions, determine the maximum number of contiguous days with the same return value after omitting up to k days.

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.

How would you design a LinkedIn-like system that instantly shows whether a profile is a first-, second-, or third-level connection for a user at very large scale?

Given a string where you can make certain edits, determine whether it can become a palindrome.

You're trying to take a photograph of two teams arranged in rows. How would you order them so shorter players are in front and taller players are behind?

Given a stream of Uber ride requests, compute the number of ride requests in every 15-minute window.

Given two strings and two allowed operations, swapping positions of letters and converting all occurrences of one character to another, can the first string be transformed into the second?

What do you know about algorithms?

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 pos...

Given a binary tree, find the shortest path from the root to a leaf.

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