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

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 2 SOLUTIONS - 🧑 (programming.dev)

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

29 comments fedilink hide all child comments

Day 2: Gift Shop

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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[–] strlcpy@lemmy.sdf.org 2 points 15 hours ago* (last edited 11 hours ago)

DOS + BIOS boot (hybrid binary)

QEMU screenshot

Repo | day02.asm | .COM download

Got the x86-16 assembly implementation working at last! Here, 64-bit integer math, especially lots of divisions by power of 10, wasn't going to do so the code instead operates on fixed-width, zero-padded numeric strings. Lots of time lost to debugging control flow/logic mistakes this time. I need to make printf() a priority!

Short input so no space issues, sitting comfortably at 45K, well below the 64K COM limit! Sadly no time yet to add animations or anything cool.