diff options
Diffstat (limited to '')
| -rw-r--r-- | 2023/04-Scratchcards/example | 6 | ||||
| -rw-r--r-- | 2023/04-Scratchcards/first.hs | 59 | ||||
| -rw-r--r-- | 2023/04-Scratchcards/input | 213 | ||||
| -rw-r--r-- | 2023/04-Scratchcards/second.hs | 69 |
4 files changed, 347 insertions, 0 deletions
diff --git a/2023/04-Scratchcards/example b/2023/04-Scratchcards/example new file mode 100644 index 0000000..9bdb874 --- /dev/null +++ b/2023/04-Scratchcards/example @@ -0,0 +1,6 @@ +Card 1: 41 48 83 86 17 | 83 86 6 31 17 9 48 53 +Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19 +Card 3: 1 21 53 59 44 | 69 82 63 72 16 21 14 1 +Card 4: 41 92 73 84 69 | 59 84 76 51 58 5 54 83 +Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36 +Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11 diff --git a/2023/04-Scratchcards/first.hs b/2023/04-Scratchcards/first.hs new file mode 100644 index 0000000..99e5df5 --- /dev/null +++ b/2023/04-Scratchcards/first.hs @@ -0,0 +1,59 @@ +-- requires cabal install --lib megaparsec parser-combinators +module Main (main) where + +import Control.Applicative.Permutations +import Control.Monad (void, when) +import Data.Char qualified as C +import Data.Either +import Data.List qualified as L +import Data.Map qualified as M +import Data.Maybe +import Data.Set qualified as S +import Data.Void (Void) +import Text.Megaparsec +import Text.Megaparsec.Char + +exampleExpectedOutput = 13 + +data Card = Card Int [Int] [Int] deriving Show +type Input = [Card] + +type Parser = Parsec Void String + +parseNumber :: Parser Int +parseNumber = read <$> some digitChar <* many (char ' ') + +parseCard :: Parser Card +parseCard = do + id <- string "Card" *> many (char ' ') *> parseNumber <* char ':' <* many (char ' ') + winnings <- some parseNumber + void $ char '|' <* many (char ' ') + numbers <- some parseNumber + return $ Card id winnings numbers + +parseInput' :: Parser Input +parseInput' = some (parseCard <* eol) <* eof + +parseInput :: String -> IO Input +parseInput filename = do + input <- readFile filename + case runParser parseInput' filename input of + Left bundle -> error $ errorBundlePretty bundle + Right input' -> return input' + +compute :: Input -> Int +compute = sum . map compute' + where + compute' :: Card -> Int + compute' (Card _ winnings numbers) | wins == 0 = 0 + | otherwise = 2 ^ (wins - 1) + where + wins = length $ winnings `L.intersect` numbers + +main :: IO () +main = do + example <- parseInput "example" + let exampleOutput = compute example + when (exampleOutput /= exampleExpectedOutput) (error $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput) + input <- parseInput "input" + print $ compute input diff --git a/2023/04-Scratchcards/input b/2023/04-Scratchcards/input new file mode 100644 index 0000000..66672be --- /dev/null +++ b/2023/04-Scratchcards/input @@ -0,0 +1,213 @@ +Card 1: 58 6 71 93 96 38 25 29 17 8 | 79 33 93 58 53 96 71 8 67 90 17 6 46 85 64 25 73 32 18 52 77 16 63 2 38 +Card 2: 34 79 17 22 15 73 61 58 46 32 | 36 53 22 32 56 15 71 7 17 19 79 81 44 59 46 34 52 61 24 73 54 28 88 50 58 +Card 3: 20 71 73 21 96 61 4 66 19 47 | 55 31 54 72 47 2 61 19 36 4 92 64 68 20 96 21 75 49 73 67 66 26 12 71 98 +Card 4: 6 34 71 49 82 67 22 9 72 96 | 49 32 84 82 2 72 60 67 14 99 22 9 38 6 7 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index 0000000..4921aa6 --- /dev/null +++ b/2023/04-Scratchcards/second.hs @@ -0,0 +1,69 @@ +-- requires cabal install --lib megaparsec parser-combinators +module Main (main) where + +import Control.Applicative.Permutations +import Control.Monad (void, when) +import Data.Char qualified as C +import Data.Either +import Data.List qualified as L +import Data.Map qualified as M +import Data.Maybe +import Data.Set qualified as S +import Data.Void (Void) +import Text.Megaparsec +import Text.Megaparsec.Char + +import Debug.Trace + +exampleExpectedOutput = 30 + +data Card = Card Int [Int] [Int] deriving Show +type Input = [Card] + +type Parser = Parsec Void String + +parseNumber :: Parser Int +parseNumber = read <$> some digitChar <* many (char ' ') + +parseCard :: Parser Card +parseCard = do + id <- string "Card" *> many (char ' ') *> parseNumber <* char ':' <* many (char ' ') + winnings <- some parseNumber + void $ char '|' <* many (char ' ') + numbers <- some parseNumber + return $ Card id winnings numbers + +parseInput' :: Parser Input +parseInput' = some (parseCard <* eol) <* eof + +parseInput :: String -> IO Input +parseInput filename = do + input <- readFile filename + case runParser parseInput' filename input of + Left bundle -> error $ errorBundlePretty bundle + Right input' -> return input' + +compute :: Input -> Integer +compute = fst . L.foldl' compute' (0, L.repeat 1) . map score' + where + compute' :: (Integer, [Integer]) -> Int -> (Integer, [Integer]) + compute' (acc, stack) score = (acc', stack') + where + copies = head stack + acc' = acc + copies + (scored, remain) = L.splitAt score $ tail stack + stack' = map (+ copies) scored ++ remain + score' :: Card -> Int + score' (Card _ winnings numbers) | wins == 0 = 0 + | otherwise = wins + where + wins = length $ winnings `L.intersect` numbers + +main :: IO () +main = do + example <- parseInput "example" + let exampleOutput = compute example + when (exampleOutput /= exampleExpectedOutput) (error $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput) + input <- parseInput "input" + print $ compute input + |