Practice

The problem sets, each on its own page: the file as it was written rather than tidied for display, and every solution runnable in your browser against the real input. Project Euler answers are never printed: the site asks that they are not published, and a page that hands you the number is not one worth having.

• 01

  Project Euler

  Number theory, combinatorics and brute force that had to stop being brute force. Pick a problem number and the solution appears beside it, runnable through Pyodide.

  open Euler →
• 02

  LeetCode

  The interview set, with the complexity of each answer stated rather than implied, and the test cases run in the page.

  open LeetCode →
• 03

  Advent of Code 2025

  Twenty-five days of puzzles, listed in the project index alongside the source.

  find it in the index →