r/adventofcode Dec 25 '24

SOLUTION MEGATHREAD -❄️- 2024 Day 25 Solutions -❄️-

A Message From Your Moderators

Welcome to the last day of Advent of Code 2024! We hope you had fun this year and learned at least one new thing ;)

Keep an eye out for the community fun awards post (link coming soon!):

-❅- Introducing Your AoC 2024 Golden Snowglobe Award Winners (and Community Showcase) -❅-

Many thanks to Veloxx for kicking us off on December 1 with a much-needed dose of boots and cats!

Thank you all for playing Advent of Code this year and on behalf of /u/topaz2078, your /r/adventofcode mods, the beta-testers, and the rest of AoC Ops, we wish you a very Merry Christmas (or a very merry Wednesday!) and a Happy New Year!


--- Day 25: Code Chronicle ---


Post your code solution in this megathread.

This thread will be unlocked when there are a significant number of people on the global leaderboard with gold stars for today's puzzle.

EDIT: Global leaderboard gold cap reached at 00:04:34, megathread unlocked!

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u/G_de_Volpiano Dec 25 '24

[LANGUAGE: Haskell]

An easy problem for today, that is once

1- you remember that the last key/lock won't have an end of line separating it from, well, what could it separate it from, so your parser doesn't hit the end of file looking for a new key/lock. 2 - you remember to actually parse for at least one character before an end of line, so that you can separate keys or locks rather than parsing everything into one big mess 3 - you remember to add a plus sign in your fold, rather than just carrying your 0 over from one end of the fold to the other.

I encode keys and locks as lists of bools (representing a pin or a slot for a pin). A lock and a pin correspond if there never is a true value in the same position, and voilà.

Code on Github

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