Algorithms

NOTE: This program expects you to have an understanding of the essentials of the C language. C++ or other languages are not supported.

Practice Algorithms. Write C, distraction-free from AI.

Algorithms is a self-contained algorithm practice app. With a built-in retro C compiler and 150+ algorithmic problems to solve across twenty categories, you will train yourself for programming job interviews, learn new algorithms and tricks, and keep your programming skills fresh in the times where nobody wants to code anymore.

Browse a searchable catalog with difficulty, category, and solved state

Open a problem: read the description, example inputs and outputs and hints if you get stuck

A real-time source disassembly helps you understand how your C code translates into machine code

Use asm { } blocks and drop down to assembly if you dare

Run the complete test set, including hidden cases, and validate your solutions

Record accepted runs with tests passed, instructions executed, and code size

Inspect compiled instructions that follow the editor caret

Choose to code in a polished modern environment, or a retro environment simulating 1980s GUIs.

The sandboxed virtual machine has no clock, no randomness, and no host access. The same solution costs the same number of instructions on every machine, so a recorded best is worth comparing.

Algorithms has no accounts and no subscriptions and everything runs locally. There are no dependencies to external compilers.