3601933bd0
This also gives us the flexibility to have all tests passing when only part 1 is complete.
118 lines
3.6 KiB
Haskell
118 lines
3.6 KiB
Haskell
module Main (main) where
|
|
|
|
import Control.Monad
|
|
import Control.Monad.State
|
|
import Data.Bifunctor
|
|
import Data.ByteString.Lazy qualified as BL
|
|
import Data.Functor
|
|
import Data.Maybe
|
|
import Data.Text (Text)
|
|
import Data.Text qualified as T
|
|
import Data.Text.Encoding (encodeUtf8)
|
|
import Data.Text.IO qualified as T
|
|
import Data.Void
|
|
import Test.Tasty
|
|
import Test.Tasty.Golden (goldenVsString)
|
|
import Test.Tasty.Ingredients.ConsoleReporter
|
|
import Text.Megaparsec hiding (Pos)
|
|
import Text.Megaparsec.Char
|
|
import Text.Megaparsec.Char.Lexer qualified as Lex
|
|
|
|
main :: IO ()
|
|
main =
|
|
defaultMain
|
|
. localOption (Always :: UseColor)
|
|
$ testGroup
|
|
"tests"
|
|
[ puzzleTest puzzle1
|
|
, puzzleTest puzzle2
|
|
]
|
|
|
|
puzzleTest :: Puzzle a -> TestTree
|
|
puzzleTest p =
|
|
testGroup pt $
|
|
["examples", "real"] <&> \t ->
|
|
withResource (parseFile $ "inputs/" <> t <> "/" <> pt) mempty \input ->
|
|
testGroup t $
|
|
zip (map show [1 :: Int ..]) p.parts <&> \(n, pp) ->
|
|
goldenVsString n ("outputs/" <> t <> "/" <> pt <> "/" <> n) $
|
|
BL.fromStrict . encodeUtf8 . pp <$> input
|
|
where
|
|
pt = show p.number
|
|
parseFile fp =
|
|
either (fail . ("parse failure: " <>) . errorBundlePretty) pure . runParser (p.parser <* eof) fp
|
|
=<< T.readFile fp
|
|
|
|
data Puzzle input = Puzzle
|
|
{ number :: Word
|
|
, parser :: Parsec Void Text input
|
|
, parts :: [input -> Text]
|
|
}
|
|
|
|
puzzle1 :: Puzzle [(Direction, Inc)]
|
|
puzzle1 =
|
|
Puzzle
|
|
{ number = 1
|
|
, parser = flip sepEndBy newline $ (,) <$> ((char 'L' $> L) <|> (char 'R' $> R)) <*> (Inc <$> Lex.decimal)
|
|
, parts =
|
|
[
|
|
T.show
|
|
. sum
|
|
. flip evalState 50
|
|
. traverse \(d, i) -> state \p ->
|
|
let (_, p') = step i d p
|
|
in (Count if p' == 0 then 1 else 0, p')
|
|
,
|
|
T.show
|
|
. sum
|
|
. flip evalState 50
|
|
. traverse \(d, i) -> state \p ->
|
|
let (c, p') = step i d p
|
|
c' = case d of
|
|
R -> abs c
|
|
L ->
|
|
if
|
|
| p == 0 -> abs c - 1
|
|
| p' == 0 -> abs c + 1
|
|
| otherwise -> abs c
|
|
in (c', p')
|
|
]
|
|
}
|
|
|
|
data Direction = L | R
|
|
deriving (Eq, Ord, Show)
|
|
|
|
newtype Pos = Pos Int
|
|
deriving newtype (Eq, Ord, Show, Num)
|
|
|
|
newtype Inc = Inc Int
|
|
deriving newtype (Eq, Ord, Show, Num)
|
|
|
|
newtype Count = Count Int
|
|
deriving newtype (Eq, Ord, Show, Num)
|
|
|
|
step :: Inc -> Direction -> Pos -> (Count, Pos)
|
|
step (Inc i) d (Pos p) = bimap Count Pos case d of
|
|
L -> (p - i) `divMod` 100
|
|
R -> (p + i) `divMod` 100
|
|
|
|
puzzle2 :: Puzzle [(ID, ID)]
|
|
puzzle2 =
|
|
Puzzle
|
|
{ number = 2
|
|
, parser = (<* newline) $ flip sepBy (char ',') $ (,) <$> (Lex.decimal <* char '-') <*> Lex.decimal
|
|
, parts =
|
|
[
|
|
T.show
|
|
. sum
|
|
. concatMap
|
|
(mapMaybe (\n -> guard (isRepetition n) $> n) . uncurry enumFromTo)
|
|
]
|
|
}
|
|
|
|
newtype ID = ID Int
|
|
deriving newtype (Eq, Ord, Show, Num, Enum)
|
|
|
|
isRepetition :: ID -> Bool
|
|
isRepetition (T.show -> n) = uncurry (==) $ T.splitAt (T.length n `div` 2) n
|