cs.thefarshad

Computer Science

Topics across data structures, algorithms, mathematics, systems, and more — with visualizers and practice problems.

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best Ω(n log n)avg Θ(n log n)worst O(n²)space O(log n)unstable

Practice problems

Solve practice problems and run Python or JavaScript right in your browser.

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Tracks

Browse by area — each track has lessons, visualizers, and problems.

Foundations

Mathematics

Algebra, trigonometry, logarithms, and logic — the math under CS.

Theory of Computation

Automata, Turing machines, computability, and complexity.

Formal Logic

Connectives, truth tables, natural deduction, and predicate logic.

Programming

Python

Syntax, collections, functions, OOP, and generators — runnable.

C++

Pointers and memory, RAII, templates, the STL, and modern C++.

Compilers

Lexing, parsing, ASTs, and code generation.

Algorithms & Data Structures

Data Structures

Arrays, lists, trees, heaps, graphs — every structure, animated.

Algorithms

Sorting, searching, graphs, DP, and shortest paths.

Systems & Databases

Systems

Big-O, operating systems, networking, database internals.

System Design

Scaling, caching, consistency, consensus, case studies.

SQL

Queries, joins, indexes, transactions — with a live playground.

Cryptography & Security

Hashing, encryption, public-key, and common attacks.

AI, ML & Robotics

Machine Learning

Linear models, neural networks, clustering, and evaluation.

Reinforcement Learning

Reinforcement learning, optimization, and the math behind it.

Robotics

Kinematics, PID control, path planning, and perception.

Developer Tools

Git

The commit DAG and workflows, explored interactively.

Bash

The shell, pipes, and scripting in a safe sandbox.

Frontiers

Computer Graphics

Transforms, rasterization, 3D projection, and ray tracing.

Quantum Computing

Qubits, superposition, gates, and measurement.