This comprehensive guide covers 50 essential Data Structures interview questions that every developer should know. These questions cover fundamental data structures, their operations, time/space complexity, and when to use each structure commonly asked in technical interviews.

## Arrays & Lists

Arrays are fundamental data structures. These questions test your knowledge of array operations, dynamic arrays, and list implementations.

## Linked Lists

Linked lists provide dynamic memory allocation. Master these questions to demonstrate your understanding of singly/doubly linked lists, operations, and trade-offs.

## Stacks & Queues

Stacks and queues are linear data structures with specific access patterns. These questions cover LIFO/FIFO principles, implementations, and use cases.

## Trees & Binary Trees

Trees are hierarchical data structures. These questions cover binary trees, BST, AVL trees, traversals, and tree operations.

## Graphs & Hash Tables

Graphs represent relationships, hash tables provide fast lookups. These questions cover graph representations, traversal algorithms, and hash table implementations.

Comprehensive collection of 50 essential Data Structures interview questions covering arrays, linked lists, trees, graphs, hash tables, and algorithm complexity.

Data Structures Interview Practice

What is a data structure?