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Day 2: Red-Nosed Reports

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[-] LeixB@lemmy.world 2 points 2 weeks ago

Haskell

Had some fun with arrows.

import Control.Arrow
import Control.Monad

main = getContents >>= print . (part1 &&& part2) . fmap (fmap read . words) . lines

part1 = length . filter isSafe
part2 = length . filter (any isSafe . removeOne)

isSafe = ap (zipWith (-)) tail >>> (all (between 1 3) &&& all (between (-3) (-1))) >>> uncurry (||)
 where
  between a b = (a <=) &&& (<= b) >>> uncurry (&&)

removeOne [] = []
removeOne (x : xs) = xs : fmap (x :) (removeOne xs)
[-] lwhjp@lemmy.sdf.org 1 points 2 weeks ago

I like the branched pipelines in isSafe! Very cute.

this post was submitted on 02 Dec 2024
39 points (97.6% liked)

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