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 common ancestors in a tree. Has video answer
6 months ago
List the Differences Between Two Strings
3 years ago2 answers
Determine a ship's capacity to ship packages in D days.
3 years ago
Given a collection of rooms where Alibada is in one and moves one room a day to an adjacent room, write a program to determine if you can find Alibada with the given list of rooms.
4 years ago2 answers
Given an array of points on a plane (x,y), write a function to return the distance between the closest pair of points.
2 years ago1 answer
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Implement a JavaScript function for Promise.all().
2 years ago1 answer
Find the lowest common ancestor (LCA) of two nodes in a binary tree.
+2a year ago9 answers
Find the shortest path in a graph.
4 years ago3 answers
Calculate the minimum number of turns required to open a lock. Has video answer
Given a Directed Acyclic Graph (DAG), write a function to return the length of the longest path.
3 years ago
Find all permutations of a given string.
5 years ago2 answers
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.
6 months ago
Find the shortest subsequence of a cyclic string S that contains all characters of a pattern k.
2 years ago
Given an array of n integers and a number k, find the maximum number of elements whose sum is less than k, and return their sum.
2 years ago1 answer
Determine if an array of integers from 1 to n contains a duplicate in constant time and space.
2 years ago2 answers
Remove duplicates in an array of objects.
a year ago
Array Manipulation: Given an array, implement functions to perform add, remove, update operations and return the resulting array.
a year ago
Given the row and column, return the value at that position in Pascal's triangle.
a year ago1 answer
Find the longest palindromic subsequence using dynamic programming.
+37 months ago10 answers
Implement a leaderboard that maintains the best score player at the top and gets any player in O(1) time.
2 years ago

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Data Structures & Algorithms Interview Questions

Find the common ancestors in a tree. Has video answer

List the Differences Between Two Strings

Determine a ship's capacity to ship packages in D days.

Given a collection of rooms where Alibada is in one and moves one room a day to an adjacent room, write a program to determine if you can find Alibada with the given list of rooms.

Given an array of points on a plane (x,y), write a function to return the distance between the closest pair of points.

Implement a JavaScript function for Promise.all().

Find the lowest common ancestor (LCA) of two nodes in a binary tree.

Find the shortest path in a graph.

Calculate the minimum number of turns required to open a lock. Has video answer

Given a Directed Acyclic Graph (DAG), write a function to return the length of the longest path.

Find all permutations of a given string.

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.

Find the shortest subsequence of a cyclic string S that contains all characters of a pattern k.

Given an array of n integers and a number k, find the maximum number of elements whose sum is less than k, and return their sum.

Determine if an array of integers from 1 to n contains a duplicate in constant time and space.

Remove duplicates in an array of objects.

Array Manipulation: Given an array, implement functions to perform add, remove, update operations and return the resulting array.

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

Find the longest palindromic subsequence using dynamic programming.

Implement a leaderboard that maintains the best score player at the top and gets any player in O(1) time.

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