◆ Interactive lessons

Data Structures &
Algorithms

Explore arrays, graphs, and other topics with animations and code examples.

Topics

Step by step

Interactive demos

Python + JS

Code examples

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Foundation

Data Structures

Explore how data structures store and organize information.

Techniques

Algorithms

Patterns and strategies for solving algorithm problems.

Reference

Complexity at a Glance

Compare time and space complexity.

Data structure	Access	Search	Insert	Delete	Space

Hash-map bounds are expected averages under suitable hashing; resizing is amortized. Heap access means the root. Linked-list insertion and deletion (‡) assume the node or its predecessor is already known. In trie bounds, m is the key length. Space includes the stored data.

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