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.

EC 2025

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

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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])
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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 4 SOLUTIONS - 🎄 (programming.dev)

submitted 2 weeks ago by CameronDev@programming.dev to c/advent_of_code@programming.dev

27 comments fedilink hide all child comments

Day 4: Printing Department

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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[–] mykl@lemmy.world 5 points 2 weeks ago* (last edited 2 weeks ago) (3 children)

Uiua

Suspiciously easy. I even included a free animation generator for your entertainment.

"..@@.@@@@.\n@@@.@.@.@@\n@@@@@.@.@@\n@.@@@@..@.\n@@.@@@@.@@\n.@@@@@@@.@\n.@.@.@.@@@\n@.@@@.@@@@\n.@@@@@@@@.\n@.@.@@@.@."
# You can run against your own input by dragging your file
# onto this pane and uncommenting the line below.
# &fras"day4.txt" # edit to match the filename.
⊜(=@@)⊸≠@\n
N₈ ← ⊂A₂C₂
R  ← ×<4⊸(/+⬚0↻)N₈
P₁ ← /+♭R
P₂ ← /+♭-⊸⍥(-⊸R)∞
P₃ ← ⍥(▽₃10)<1e6/×⊸△⍥⊸(-⊸R)∞
⊃(P₁|P₂|P₃)

[–] CameronDev@programming.dev 3 points 2 weeks ago (1 children)

Love a good visualisation <3

I was gonna do the same later when some free time, was wondering if it generated some kind of image.

[–] mykl@lemmy.world 3 points 2 weeks ago

If you click the link on that post, you'll see that the test data does resolve to a (very low res) elf!

[–] Deebster@programming.dev 3 points 2 weeks ago* (last edited 2 weeks ago)

Now you're just showing off!

Edit: ooh, this makes it obvious that my puzzle input takes more cycles to reach the done state.

[–] Quant@programming.dev 2 points 2 weeks ago (1 children)

That's a great addition :D

Running my own input I also noticed that your solution is a lot faster than mine (processing each roll individually). I'll keep that 2D-rotation in mind for the future.

[–] mykl@lemmy.world 1 points 2 weeks ago

Yeah, that's one thing the gurus keep hammering home: anything you can move out of loop constructs (inc rows, partition, etc as well as the obvious do, repeat) and handle pervasively is a big win.