Master Data Structures
Build a solid foundation in computer science through interactive visualizations, real code examples, and guided practice problems.
All Topics
Choose a data structure to begin your deep dive.
Arrays
Contiguous memory blocks providing O(1) indexed access -- the most fundamental building block in programming.
Linked Lists
Dynamic node chains connected through pointers for flexible insertion and deletion.
Stacks
Last-In-First-Out structures powering undo systems and expression parsing.
Queues
First-In-First-Out buffers for task scheduling and breadth-first traversals.
Hash Tables
Key-value stores enabling near-constant-time lookups through hashing.
Trees
Hierarchical structures for efficient searching, sorting, and data organization.
Graphs
Networks of vertices and edges modeling complex relationships and pathways.
Tries
Prefix trees for ultra-fast string searching and autocomplete features.
Problems
Pick a topic to see problems and practice with code.
Arrays Problems
10 practice problems to solve with code and interactive visualization.
Linked Lists Problems
7 practice problems to solve with code and interactive visualization.
Stacks Problems
6 practice problems to solve with code and interactive visualization.
Queues Problems
6 practice problems to solve with code and interactive visualization.
Hash Tables Problems
6 practice problems to solve with code and interactive visualization.
Trees Problems
7 practice problems to solve with code and interactive visualization.
Graphs Problems
7 practice problems to solve with code and interactive visualization.
Tries Problems
5 practice problems to solve with code and interactive visualization.