From: Neil Smith Date: Fri, 11 Dec 2020 09:45:15 +0000 (+0000) Subject: Done day 5 X-Git-Url: https://git.njae.me.uk/?a=commitdiff_plain;h=55b6bbccec21b1f2560c84f3578dbafd32a2cede;p=advent-of-code-20.git Done day 5 --- diff --git a/advent05/package.yaml b/advent05/package.yaml new file mode 100644 index 0000000..c0b12aa --- /dev/null +++ b/advent05/package.yaml @@ -0,0 +1,61 @@ +# This YAML file describes your package. Stack will automatically generate a +# Cabal file when you run `stack build`. See the hpack website for help with +# this file: . + +name: advent05 +synopsis: Advent of Code +version: '0.0.1' + +default-extensions: +- AllowAmbiguousTypes +- ApplicativeDo +- BangPatterns +- BlockArguments +- DataKinds +- DeriveFoldable +- DeriveFunctor +- DeriveGeneric +- DeriveTraversable +- EmptyCase +- FlexibleContexts +- FlexibleInstances +- FunctionalDependencies +- GADTs +- GeneralizedNewtypeDeriving +- ImplicitParams +- KindSignatures +- LambdaCase +- MonadComprehensions +- MonoLocalBinds +- MultiParamTypeClasses +- MultiWayIf +- NamedFieldPuns +- NegativeLiterals +- NumDecimals +# - OverloadedLists +# - OverloadedStrings +- PartialTypeSignatures +- PatternGuards +- PatternSynonyms +- PolyKinds +- RankNTypes +- RecordWildCards +- ScopedTypeVariables +- TemplateHaskell +- TransformListComp +- TupleSections +- TypeApplications +- TypeFamilies +- TypeInType +- TypeOperators +- ViewPatterns + +executables: + advent05: + main: advent05.hs + source-dirs: src + dependencies: + - base >= 2 && < 6 + - text + - megaparsec + - containers \ No newline at end of file diff --git a/advent05/src/advent05.hs b/advent05/src/advent05.hs new file mode 100644 index 0000000..06d0ecc --- /dev/null +++ b/advent05/src/advent05.hs @@ -0,0 +1,26 @@ +-- import Debug.Trace + +import Numeric +import qualified Data.Set as S + +main :: IO () +main = + do text <- readFile "data/advent05.txt" + let passes = lines text + print $ part1 passes + print $ part2 passes + +part1 = maximum . map convert + +part2 passes = S.elemAt 0 $ expecteds `S.difference` knowns + where ns = map convert passes + highest = maximum ns + lowest = minimum ns + knowns = S.fromList ns + expecteds = S.fromList [lowest..highest] + +directionToInt :: Char -> Int +directionToInt dir = if dir `elem` "BR" then 1 else 0 + +convert :: String -> Int +convert = fst . head . readInt 2 (`elem` "FBLR") directionToInt diff --git a/data/advent05.txt b/data/advent05.txt new file mode 100644 index 0000000..acff32c --- /dev/null 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