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

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🌟 - 2023 DAY 13 SOLUTIONS -🌟 (programming.dev)

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

17 comments fedilink hide all child comments

Day 13: Point of Incidence

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)

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[–] lwhjp@lemmy.sdf.org 6 points 11 months ago (2 children)

Haskell

This was fun and (fairly) easy! Off-by-one errors are a likely source of bugs here.

import Control.Monad
import Data.List
import Data.List.Split
import Data.Maybe

score d pat = ((100 *) &lt;$> search pat) `mplus` search (transpose pat)
  where
    search pat' = find ((d ==) . rdiff pat') [1 .. length pat' - 1]
    rdiff pat' i =
      let (a, b) = splitAt i pat'
       in length $ filter (uncurry (/=)) $ zip (concat $ reverse a) (concat b)

main = do
  input &lt;- splitOn [""] . lines &lt;$> readFile "input13"
  let go d = print . sum . map (fromJust . score d) $ input
  go 0
  go 1

Line-seconds score: 0.102 😉

[–] sjmulder@lemmy.sdf.org 2 points 11 months ago

Very pretty again!

[–] abclop99@beehaw.org 1 points 11 months ago* (last edited 11 months ago) (1 children)

What does the line-seconds score mean?

Edit: https://lemmy.sdf.org/post/9116867

[–] lwhjp@lemmy.sdf.org 2 points 11 months ago* (last edited 11 months ago)

Yep, that's it. (A totally scientific and non-fakeable measurement! /s)