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

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8	9	10	11	12

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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

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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

💿 - 2024 DAY 9 SOLUTIONS -💿 (programming.dev)

submitted 11 months ago* (last edited 11 months ago) by CameronDev@programming.dev to c/advent_of_code@programming.dev

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Day 9: Disk Fragmenter

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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/
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[–] CameronDev@programming.dev 1 points 11 months ago (3 children)

You coded this on a phone, with a touchscreen keyboard? Not sure who is more impressive, you or the unicode wizard :D

[–] Deebster@programming.dev 2 points 11 months ago (1 children)

I just ran this on a laptop - it worked (part one only) but took 4h28m21s so Nushell is not a language for AoC (or I just coded it very poorly).

[–] CameronDev@programming.dev 1 points 11 months ago (1 children)

I think once your runtime hits 4 hours, the minutes and seconds stop being relevant :D

Is it 4hrs of 100% CPU?

[–] Deebster@programming.dev 2 points 11 months ago

One core was busier, but it wasn't at 100%. My Rust code yesterday was the same, perhaps it's taking too much time accessing memory.

The time was wall time (as per Starship's output) but it was still waaay too slow to bother with again!

[–] Deebster@programming.dev 1 points 11 months ago* (last edited 11 months ago)

Haha, thanks but we both know they're #1 by a country mile. I think my phone's now downclocking as it's burning up and still hasn't spat out an answer after two hours, so I technically haven't completed it yet!

Edit: Calling it for now, I might figure out later why it's so slow (there's some easy but minor gains to be made but I'm guessing there's some O(awful) going on that the input's blown up)