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
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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

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🔒 - 2025 DAY 1 SOLUTIONS -🔒 (programming.dev)

submitted 3 days ago by Ategon@programming.dev to c/advent_of_code@programming.dev

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Day 1: Secret Entrance

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

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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/
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 7 points 2 days ago (1 children)

Uiua

Today's lesson: Never think that scanning the first 100 lines of input will give you a good understanding of it.

Part 2 is really messy and could probably be much simpler, but I couldn't get the logic straight in my head otherwise.

"L68 L30 R48 L5 R60 L55 L1 L99 R14 L82"
⊜⋕⊸≠@\s∧⍜⊡⋅@¯⊚⊸⌕"L"∧⍜⊡⋅@+⊚⊸⌕"R"
P₁ ← ⧻⊚=0\(◿100+)⊂50
P ← (
  ⊃(-×100×|/+)⌊÷100⌵⟜(⊸±) # Count and remove all over-rotations
  ⍉⊟↘¯1⊸(\(◿100+)⊂50)     # Take all positions and next moves.
  ▽⊸≡(≠0⊢)                # Ignore any starting from zero
  +/+↥⊃(<0|>100)≡/+       # Sum the pairs, check for passing zero.
)
P₂ ← +⊃P P₁
⊃(P₁|P₂)

[–] mykl@lemmy.world 4 points 2 days ago

Just had a look at the Uiua Discord, and Part 2 can be simplified a little...

"L68 L30 R48 L5 R60 L55 L1 L99 R14 L82"
⊜⋕⊸≠@\s∧⍜⊡⋅@¯⊚⊸⌕"L"∧⍜⊡⋅@+⊚⊸⌕"R"
P₁ ← ⧻⊚=0\(◿100+)⊂50
P₂ ← /+=0◿100\+▽⌵⟜±⊂50
⊃P₁ P₂

Sometimes I could just cry.