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[haskell] Solve Day 4

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This commit is contained in:
Akshay Mankar 2023-12-04 09:29:19 +01:00
parent cbf8bfce32
commit 66839b7bfd
Signed by: axeman
GPG key ID: CA08F3AB62369B89
6 changed files with 326 additions and 0 deletions
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7
answers.nix
View file

@ -20,4 +20,11 @@
checkBash = false; checkBash = false;
checkRust = false; checkRust = false;
}; };
day4 = {
part1 = "20667";
part2 = "5833065";
checkHaskell = true;
checkBash = false;
checkRust = false;
};
} }

1
haskell/aoc2023.cabal
View file

@ -23,6 +23,7 @@ library
exposed-modules: Day1 exposed-modules: Day1
, Day2 , Day2
, Day3 , Day3
, Day4
executable aoc2023 executable aoc2023
import: warnings import: warnings

2
haskell/app/Main.hs
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@ -6,6 +6,7 @@ import Day1 qualified
import Day2 qualified import Day2 qualified
import System.Environment (getArgs) import System.Environment (getArgs)
import qualified Day3 import qualified Day3
import qualified Day4
main :: IO () main :: IO ()
main = do main = do
@ -13,4 +14,5 @@ main = do
["day1"] -> Day1.run ["day1"] -> Day1.run
["day2"] -> Day2.run ["day2"] -> Day2.run
["day3"] -> Day3.run ["day3"] -> Day3.run
["day4"] -> Day4.run
args -> error $ "Invlaid args: " <> show args args -> error $ "Invlaid args: " <> show args

99
haskell/src/Day4.hs Normal file
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@ -0,0 +1,99 @@
module Day4 where
import Data.Char
import Data.IntMap (IntMap)
import Data.IntMap.Lazy qualified as IntMap
import Text.ParserCombinators.ReadP
import Data.Maybe (fromMaybe)
run :: IO ()
run = do
cards <- readInput
putStrLn $ "Part 1 Answer: " <> show (part1 cards)
putStrLn $ "Part 2 Answer: " <> show (part2 cards)
part1 :: Cards -> Int
part1 cards =
sum $ IntMap.map (uncurry points) cards
matches :: WinningNumbers -> ActualNumbers -> Int
matches winners = foldr (\x acc -> if x `elem` winners then acc + 1 else acc) 0
-- >>> points [41,48,83,86,17] [83,86,6,31,17,9,48,53]
-- 8
points :: WinningNumbers -> ActualNumbers -> Int
points winners actual =
let m = matches winners actual
in if m == 0
then 0
else 2 ^ (m - 1)
part2 :: Cards -> Int
part2 cards =
sum $ IntMap.foldlWithKey' processCard (initCollection cards) cards
processCard :: CardCollection -> Int -> (WinningNumbers, ActualNumbers) -> CardCollection
processCard acc cardId (winners, actual) =
let m = matches winners actual
curCopies = fromMaybe 0 $ IntMap.lookup cardId acc
in foldr (IntMap.adjust (+ curCopies)) acc [cardId+1 .. cardId+m]
type CardCollection = IntMap Int
initCollection :: Cards -> CardCollection
initCollection = IntMap.map (const 1)
type WinningNumbers = [Int]
type ActualNumbers = [Int]
type Cards = IntMap (WinningNumbers, ActualNumbers)
readInput :: IO Cards
readInput = do
input <- getContents
case readP_to_S (parseCards <* eof) input of
[] -> error "parser failed"
[(cards, "")] -> pure cards
x -> error $ "parser failed: " <> show x
parseNumber :: ReadP Int
parseNumber = read <$> many1 (satisfy isDigit)
parseTwoDigitNumber :: ReadP Int
parseTwoDigitNumber = do
digit1Chr <- satisfy (`elem` " 0123456789")
digit2 <- digitToInt <$> satisfy isDigit
if digit1Chr == ' '
then pure digit2
else pure (digitToInt digit1Chr * 10 + digit2)
-- >>> readP_to_S (parseCardId <* eof) "Card 1: "
-- [(1,"")]
parseCardId :: ReadP Int
parseCardId = do
_ <- string "Card"
_ <- skipSpaces
cardId <- parseNumber
_ <- string ": "
pure cardId
-- >>> readP_to_S (parseNumbers <* eof) "41 48 83 86 17"
-- [([41,48,83,86,17],"")]
parseNumbers :: ReadP [Int]
parseNumbers = do
sepBy1 parseTwoDigitNumber (char ' ')
-- >>> readP_to_S (parseCard <* eof) "Card 1: 41 48 83 86 17 | 83 86 6 31 17 9 48 53"
-- [((1,([41,48,83,86,17],[83,86,6,31,17,9,48,53])),"")]
parseCard :: ReadP (Int, (WinningNumbers, ActualNumbers))
parseCard = do
cardId <- parseCardId
winning <- parseNumbers
_ <- string " | "
actual <- parseNumbers
pure (cardId, (winning, actual))
parseCards :: ReadP Cards
parseCards =
IntMap.fromList <$> sepBy1 parseCard (char '\n')

211
input/day4 Normal file
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@ -0,0 +1,211 @@
Card 1: 82 41 56 54 18 62 29 55 34 20 | 37 14 10 80 58 11 65 96 90 8 59 32 53 21 98 83 17 9 87 25 71 77 70 73 24
Card 2: 3 18 94 53 23 49 60 44 67 9 | 77 10 44 41 17 23 83 60 49 43 94 76 67 87 66 9 73 29 3 33 92 53 18 6 47
Card 3: 85 9 33 66 70 28 91 60 96 65 | 33 56 83 65 15 23 99 60 26 66 9 70 97 11 38 1 85 96 28 59 50 91 71 48 89
Card 4: 51 5 25 18 53 30 43 49 91 21 | 21 48 1 85 51 80 18 16 9 87 66 3 14 13 39 34 5 70 69 49 28 37 72 6 98
Card 5: 32 62 99 93 37 22 64 57 94 55 | 23 1 26 15 16 6 88 4 17 69 21 46 49 70 51 45 89 91 29 52 60 86 80 8 12
Card 6: 44 52 33 82 8 30 32 62 26 61 | 59 10 89 41 24 56 48 70 92 20 3 17 94 85 97 42 8 93 51 57 44 13 12 63 78
Card 7: 71 42 27 38 36 41 95 97 34 10 | 61 36 10 38 95 71 53 99 59 88 50 72 40 27 3 78 41 28 16 42 48 54 6 82 97
Card 8: 88 80 86 60 7 77 72 29 55 36 | 91 15 8 3 16 59 70 10 90 77 56 48 22 95 78 69 94 9 38 23 35 1 17 39 7
Card 9: 79 32 28 61 34 19 71 47 87 5 | 19 87 47 14 3 68 25 71 5 65 91 89 98 36 24 34 61 38 80 32 62 28 74 79 2
Card 10: 18 95 55 5 98 22 68 70 74 92 | 5 39 92 95 36 65 98 88 70 22 3 68 45 25 15 61 63 52 74 14 55 18 17 60 47
Card 11: 89 34 46 96 6 17 45 20 69 37 | 69 28 48 79 26 17 8 37 10 18 95 88 2 94 47 46 20 45 24 11 6 32 96 89 50
Card 12: 54 53 89 19 10 64 21 46 5 90 | 52 76 30 97 77 2 91 48 88 16 27 47 39 26 59 57 25 75 11 65 98 89 21 18 84
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6
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