Meta Data Structures & Algorithms Interview Questions

Review this list of 78 Meta Data Structures & Algorithms interview questions and answers verified by hiring managers and candidates.

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Find the maximum subarray sum.
+134 months ago34 answers
Implement a circular buffer.
2 years ago4 answers
Given a list of strings, find all strings that encode to the same value using a Caesar Cipher. (A Caesar Cipher rotates characters, e.g. in CC3: a->d, b->e, ..., z->c)
8 months ago1 answer
Construct a binary tree given its preorder and inorder traversals.
+26 months ago11 answers
Given an array of task durations (in minutes), return the pairs of tasks that can be completed within 60 minutes. For example, for [1, 43, 20, 59, 30, 30], return [[0, 3], [4, 5]].
a month ago2 answers
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Merge k sorted linked lists. Has video answer
+83 days ago14 answers
Sort a K-Messed Array
2 years ago22 answers
Clone a linked list with a random pointer.
a year ago
Given an array of integers and an integer k, find the kth largest element in the array.
6 months ago4 answers
Which sorting algorithms use divide and conquer?
2 years ago2 answers
Vertical Traversal of a Binary Tree
9 months ago1 answer
Given a string with parentheses, write a function that removes the minimum number of characters to balance the parentheses.
2 years ago1 answer
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.
4 months ago1 answer
Merge two sorted lists
+36 months ago6 answers
Determine if a given binary tree is a binary search tree (BST).
+32 years ago11 answers
Simplify Path
9 months ago
Group Shifted Strings
9 months ago
3 sum
a year ago
Sort a doubly linked list using merge sort. Has video answer
6 months ago8 answers
Partition an array into two sub-arrays with equal sum.
+12 years ago7 answers

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Meta Data Structures & Algorithms Interview Questions

Find the maximum subarray sum.

Implement a circular buffer.

Given a list of strings, find all strings that encode to the same value using a Caesar Cipher. (A Caesar Cipher rotates characters, e.g. in CC3: a->d, b->e, ..., z->c)

Construct a binary tree given its preorder and inorder traversals.

Given an array of task durations (in minutes), return the pairs of tasks that can be completed within 60 minutes. For example, for [1, 43, 20, 59, 30, 30], return [[0, 3], [4, 5]].

Merge k sorted linked lists. Has video answer

Sort a K-Messed Array

Clone a linked list with a random pointer.

Given an array of integers and an integer k, find the kth largest element in the array.

Which sorting algorithms use divide and conquer?

Vertical Traversal of a Binary Tree

Given a string with parentheses, write a function that removes the minimum number of characters to balance the parentheses.

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.

Merge two sorted lists

Determine if a given binary tree is a binary search tree (BST).

Simplify Path

Group Shifted Strings

3 sum

Sort a doubly linked list using merge sort. Has video answer

Partition an array into two sub-arrays with equal sum.

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