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 Smallest Missing Integer
3 years ago15 answers
Given a list of Nodes, each with a unique string id and a list of subnodes it depends on, find the maximum depth of the dependencies.
2 years ago1 answer
Squares of sorted array
2 years ago1 answer
Calculate the trapped rainwater between bars in a given array.
+102 years ago14 answers
Implement a function that processes a stream of interval data.
a year ago
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Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in clockwise spiral order. Has video answer
2 years ago
How can you tell if a graph is not a tree?
10 years ago4 answers
Implement the power function without using pow method or or exponentiation operator.
a year ago
BST Successor Search
3 years ago13 answers
What is encapsulation?
a year ago4 answers
Sales Path
3 years ago12 answers
Sudoku Solver
+3a year ago4 answers
Find the largest perimeter of an island given a two-dimensional array of 1's and 0's representing land and water.
2 years ago1 answer
Given a number of courses and a list of prerequisite pairs, return true or false depending on whether it is possible to finish all courses.
6 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?
4 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?
4 months ago
Decrypt Message
3 years ago12 answers
Solve an array problem where you are given two arrays and need to construct a new array by multiplying values across positions.
8 months ago
You're given a time-based key-value store that keeps having new key-value pairs added. Implement a windowed average.
a year ago1 answer
Implement the memcpy() function in C.
2 years ago4 answers

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Data Structures & Algorithms Interview Questions

Find the Smallest Missing Integer

Given a list of Nodes, each with a unique string id and a list of subnodes it depends on, find the maximum depth of the dependencies.

Squares of sorted array

Calculate the trapped rainwater between bars in a given array.

Implement a function that processes a stream of interval data.

Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in clockwise spiral order. Has video answer

How can you tell if a graph is not a tree?

Implement the power function without using pow method or or exponentiation operator.

BST Successor Search

What is encapsulation?

Sales Path

Sudoku Solver

Find the largest perimeter of an island given a two-dimensional array of 1's and 0's representing land and water.

Given a number of courses and a list of prerequisite pairs, return true or false depending on whether it is possible to finish all courses.

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?

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?

Decrypt Message

Solve an array problem where you are given two arrays and need to construct a new array by multiplying values across positions.

You're given a time-based key-value store that keeps having new key-value pairs added. Implement a windowed average.

Implement the memcpy() function in C.

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