Piero Bosio Social Web Site Personale

Hello, friends! After 10(!) years of #AdventOfCode, I've made some changes to preserve my sanity: there will be 12 days of puzzles each December (still starting Dec 1) and there is no longer a global leaderboard. Read more:
https://adventofcode.com/2025/about#faq_num_days
https://adventofcode.com/2025/about#faq_leaderboard