Advent Of Code

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An unofficial home for the advent of code community on programming.dev!

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.

AoC 2023

Solution Threads

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18	19	20	21	22	23	24
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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. [2023 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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console.log('Hello World')

founded 1 year ago

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Ategon@programming.dev

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❄️ - 2023 DAY 10 SOLUTIONS -❄️ (programming.dev)

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

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Day 10: Pipe Maze

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)
Code block support is not fully rolled out yet but likely will be in the middle of the event. Try to share solutions as both code blocks and using something such as https://topaz.github.io/paste/ , pastebin, or github (code blocks to future proof it for when 0.19 comes out and since code blocks currently function in some apps and some instances as well if they are running a 0.19 beta)

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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[–] cacheson@kbin.social 2 points 11 months ago (2 children)

Nim

I got a late start on part 1, and then had to sleep on part 2. Just finished everything up with a little time to spare before day 11.

Part 2 probably would have been easier if I knew more about image processing, but I managed:

Made a copy of the grid and filled it with . tiles
Copied all of the path tiles that I had calculated in part 1
Flood-filled all the . tiles that are connected to the outside edges of the grid with O tiles
Walked along the path, looking for an adjacent O tile at each step. Stopped when one was found, and recorded whether it was to the left or right of the path.
Walked the path again, flood-filling any adjacent inside . tiles with I, and counted them

Code:

[–] Ategon@programming.dev 2 points 11 months ago* (last edited 11 months ago) (1 children)

btw if you put the url to nim as /c/nim@programming.dev I dont think the url bot will trigger since it does the same thing the ! format does

[Nim](/c/nim@programming.dev)

Nim

Edit: yeah looks like it didnt reply to me so this format works

[–] cacheson@kbin.social 2 points 11 months ago

Unfortunately then it'll be broken for kbin users. I can do it anyway though if the bot is too annoying, just lmk.

[–] CommunityLinkFixer@lemmings.world 1 points 11 months ago

Hi there! Looks like you linked to a Lemmy community using a URL instead of its name, which doesn't work well for people on different instances. Try fixing it like this: !nim@programming.dev