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

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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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Advent of Code Homepage

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

console.log('Hello World')

founded 3 years ago

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🎁 - 2025 DAY 9 SOLUTIONS - 🎁 (programming.dev)

submitted 11 months ago by CameronDev@programming.dev to c/advent_of_code@programming.dev

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Day 9: Movie Theater

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

Uiua

My silly part one solution, because I have no idea how to do part two (this is usually the difficulty at which I bow out, but I want to try actually expanding my knowledge this year!).

Parse         ← ⊜(⊜⋕⊸≠@,)⊸≠@\n
CornerClosest ← ⊏⊢⍏⊸≡⌞(/+ⁿ2-)
Big           ← 9999999
RectSize      ← /×+1⌵-
Part₁ ← (
  ∩⌟∩⌟CornerClosest 0_0 1000000_1000000 Big_0 0_Big
  ↥∩RectSize
)

$ 7,1
$ 11,1
$ 11,7
$ 9,7
$ 9,5
$ 2,5
$ 2,3
$ 7,3

&fras "9.txt"
Part₁ Parse

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