What are Data Structures? What is the difference between array and linked list? What is the difference between linear and non-linear data structure? What is the difference between stack and queue with examples. Give real life example of graph and tree with their differences. What is hasmap and heap sort? Give 1 easy coding question on string.

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Accepted Answer

Data structures are ways to organize and store data for efficient access and modification.

Data structures include arrays, linked lists, stacks, queues, trees, and graphs.
Arrays are fixed-size, contiguous memory locations; linked lists are dynamic and consist of nodes.
Linear data structures (like arrays and linked lists) have a sequential relationship; non-linear (like trees and graphs) do not.
Stacks follow Last In First Out (LIFO) principle (e.g., browser history); queues follow First In First Out (FIFO) principle (e.g., print queue).
A graph represents relationships (e.g., social networks); a tree is a hierarchical structure (e.g., file system).
HashMap is a data structure that stores key-value pairs for fast retrieval; heap sort is a comparison-based sorting algorithm.
Example coding question: Write a function to reverse a string.

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