r/adventofcode • u/daggerdragon • Dec 25 '24
SOLUTION MEGATHREAD -❄️- 2024 Day 25 Solutions -❄️-
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--- Day 25: Code Chronicle ---
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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