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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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.
8 months ago
Design an iterator.
9 months ago
Given the row and column, return the value at that position in Pascal's triangle.
a year ago1 answer
Top k frequent elements
+13 months ago1 answer
Given a list of integers, return 1 if the integer is a power of 2 and 0 if it is not.
5 years ago3 answers
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Find the shortest distance between two points.
3 months ago
Calculate the result of a mathematical expression written as a string.
3 years ago
Given a list of transactions between friends, return the minimum number of transactions required to settle the debts. For e.g. Alice gave $5 to Bob and Bob gave $5 to Bill. Answer will be 1.
2 years ago
Basic Calculator II
+19 months ago
Maximum Path Quality of a Graph
7 months ago
Implement a queue.
9 months ago
Given an organizational hierarchy, how would you model it so I can quickly find a person's direct reports and everyone under their department?
10 months ago
Design the ad management logic for surfacing ads based on user preferences or profiles.
9 months ago
Explain the time complexity differences between ArrayList and LinkedList.
2 years ago2 answers
Implement a doubly linked list.
6 months ago1 answer
Implement wildcard pattern matching for a string (s) and a pattern (p) with '?' and '*' in a way that covers the entire input string.
4 years ago3 answers
Given a fully or partially attempted 9x9 Sudoku board, determine if it is a valid solution.
6 months ago
Word ladder
+13 months ago
Implement merge-sort
2 years ago1 answer
Explain the solution for Leetcode problem 1010: Pairs of Songs With Total Durations Divisible by 60.
a month ago

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Data Structures & Algorithms Interview Questions

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.

Design an iterator.

Given the row and column, return the value at that position in Pascal's triangle.

Top k frequent elements

Given a list of integers, return 1 if the integer is a power of 2 and 0 if it is not.

Find the shortest distance between two points.

Calculate the result of a mathematical expression written as a string.

Given a list of transactions between friends, return the minimum number of transactions required to settle the debts. For e.g. Alice gave $5 to Bob and Bob gave $5 to Bill. Answer will be 1.

Basic Calculator II

Maximum Path Quality of a Graph

Implement a queue.

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.

Explain the time complexity differences between ArrayList and LinkedList.

Implement a doubly linked list.

Implement wildcard pattern matching for a string (s) and a pattern (p) with '?' and '*' in a way that covers the entire input string.

Given a fully or partially attempted 9x9 Sudoku board, determine if it is a valid solution.

Word ladder

Implement merge-sort

Explain the solution for Leetcode problem 1010: Pairs of Songs With Total Durations Divisible by 60.

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