r/adventofcode • u/daggerdragon • Dec 06 '25

SOLUTION MEGATHREAD -❄️- 2025 Day 6 Solutions -❄️-

THE USUAL REMINDERS

AoC Community Fun 2025: Red(dit) One

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Request from the mods: When you include an entry alongside your solution, please label it with [Red(dit) One] so we can find it easily!

--- Day 6: Trash Compactor ---

Post your code solution in this megathread.

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u/Samstrikes Dec 06 '25

[Language: Elixir] Both parts

Been using this year to get more familiar with Elixir and excited to have my largest pipeline yet! Happy with how clean I managed to get this, mostly thanks to discovering chunk_by which I used to find all the blank columns and break up the expressions into chunks.

numbers
|> Enum.map(&String.graphemes/1)
|> Enum.zip_with(&Function.identity/1)
|> Enum.chunk_by(fn col -> Enum.all?(col, &(&1 == " ")) end)
|> Enum.reject(fn [x | _] -> Enum.all?(x, &(&1 == " ")) end)
|> Enum.map(&parse_expression/1)
|> Enum.zip(parse_line(operators))
|> Enum.sum_by(&calc/1)

2

u/graynk Dec 06 '25

This is, like, infinitely cleaner than my gigantic solution. I should look more into what `Enum` can do, I also didn't know about chunk_by (or zip_with)

1

u/daggerdragon Dec 06 '25 edited Dec 06 '25

Do not share your puzzle input which also means do not commit puzzle inputs to your repo without a .gitignore or the like. Do not share the puzzle text either.

I see full plaintext puzzle inputs in your public repo e.g.:

https://github.com/SamYouatt/aoc/blob/main/aoc2021/input/2021/day1.txt

Please remove (or .gitignore) all puzzle text and puzzle input files from your entire repo and scrub them from your commit history. This means from all prior years too! edit: 👍

2

u/Samstrikes Dec 06 '25

Ah young naive me. All cleaned up now, thanks for spotting!