Advent Of Code

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An unofficial home for the advent of code community on programming.dev! Other challenges are also welcome!

Advent of Code is an annual Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like.

Everybody Codes is another collection of programming puzzles with seasonal events.

AoC 2025

Solution Threads

M	T	W	T	F	S	S
1	2	3	4	5	6	7
8	9	10	11	12

Visualisations Megathread

Rules/Guidelines

Follow the programming.dev instance rules
Keep all content related to advent of code in some way
If what youre posting relates to a day, put in brackets the year and then day number in front of the post title (e.g. [2024 Day 10])
When an event is running, keep solutions in the solution megathread to avoid the community getting spammed with posts

Relevant Communities

Relevant Links

Advent of Code Homepage

Credits

Icon base by Lorc under CC BY 3.0 with modifications to add a gradient

console.log('Hello World')

founded 2 years ago

MODERATORS

Ategon@programming.dev

Sigmatics@lemmy.ca

CameronDev@programming.dev

hades@programming.dev

❄ - 2025 DAY 12 SOLUTIONS - ❄ (programming.dev)

submitted 1 week ago by CameronDev@programming.dev to c/advent_of_code@programming.dev

14 comments fedilink hide all child comments

Day 12: Christmas Tree Farm

Megathread guidelines

Keep top level comments as only solutions, if you want to say something other than a solution put it in a new post. (replies to comments can be whatever)
You can send code in code blocks by using three backticks, the code, and then three backticks or use something such as https://topaz.github.io/paste/ if you prefer sending it through a URL

FAQ

What is this?: Here is a post with a large amount of details: https://programming.dev/post/6637268
Where do I participate?: https://adventofcode.com/
Is there a leaderboard for the community?: We have a programming.dev leaderboard with the info on how to join in this post: https://programming.dev/post/6631465

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[–] Deebster@programming.dev 4 points 1 week ago* (last edited 1 week ago) (1 children)

Mild spoilers ahead, but you're reading the solutions thread.

I was just doing some preliminary checking of the data on my phone with Nushell (to see how much my ageing laptop would suffer) when I discovered there weren't any non trivial cases.

Normally I get the test data working before trying the input data, this is definitely teaching me the value of investigating the data before heading down into the code mines.

Unfortunately I can't get the second star yet because I missed a few days.

[–] Pyro@programming.dev 2 points 1 week ago* (last edited 1 week ago) (1 children)

I actually did a lot of optimizations before I had to give up and search what I was missing. I did have a look at my input data, but still wouldn't make the connection because in my mind, any solution had to work for the sample too.

[–] Deebster@programming.dev 2 points 1 week ago

Yeah, it's quite a mean trick really - kinda a big middle finger to anyone who does TDD