Advent of Code is an annual event where participants solve programming puzzles in a variety of languages, with the goal of completing each puzzle as quickly as possible. The event has a leaderboard that ranks participants based on their completion times. However, some participants have raised concerns about the use of AI-assisted tools to solve the puzzles, which can give an unfair advantage. The event's creator has stated that using AI to solve puzzles is not allowed and goes against the spirit of the competition.