120 lines
5.9 KiB
Haskell
120 lines
5.9 KiB
Haskell
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-- requires cabal install --lib megaparsec parser-combinators heap vector
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module Main (main) where
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import Control.Applicative.Permutations
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import Control.Monad (void, when)
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import qualified Data.Char as C
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import Data.Either
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import Data.Functor
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import qualified Data.Heap as H
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import qualified Data.List as L
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import qualified Data.Map as M
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import Data.Maybe
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import qualified Data.Set as S
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import qualified Data.Vector as V
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import qualified Data.Vector.Unboxed as VU
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import Data.Void (Void)
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import Text.Megaparsec
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import Text.Megaparsec.Char
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import Debug.Trace
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exampleExpectedOutput = 32000000
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example2ExpectedOutput = 11687500
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data Pulse = Low | High deriving (Eq, Show)
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data Module = Normal | FlipFlop Bool | Conjunction (M.Map String Pulse) | Broadcaster deriving (Eq, Show)
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data Configuration = Configuration Module String [String] deriving (Eq, Show)
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type Conf = (Module, [String])
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type Input = M.Map String Conf
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type Parser = Parsec Void String
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parseModule :: Parser Module
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parseModule = char '%' $> FlipFlop False
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<|> char '&' $> Conjunction M.empty
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<|> lookAhead (string "broadcaster") $> Broadcaster
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<|> lookAhead letterChar $> Normal
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parseLabel :: Parser String
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parseLabel = some letterChar
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parseConfiguration :: Parser Configuration
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parseConfiguration = Configuration <$> parseModule
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<*> parseLabel <* string " -> "
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<*> some (parseLabel <* optional (string ", "))
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parseInput' :: Parser Input
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parseInput' = M.fromList . map (\(Configuration m s l) -> (s, (m, l))) <$> some (parseConfiguration <* eol) <* eof
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parseInput :: String -> IO Input
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parseInput filename = do
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input <- readFile filename
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case runParser parseInput' filename input of
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Left bundle -> error $ errorBundlePretty bundle
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Right input' -> return input'
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compute :: Input -> Int
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compute input = let (x, y) = computeX 1000 (0, 0) $ initConjuctions input in x * y
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where
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computeX :: Int -> (Int, Int) -> Input -> (Int, Int)
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computeX 0 n _ = n
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computeX i n input = let (n', input') = compute' (1, 0) [("button", Low, "broadcaster")] input
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in computeX (i-1) (scoreAdd n n') input'
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compute' :: (Int, Int) -> [(String, Pulse, String)] -> Input -> ((Int, Int), Input)
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compute' n signals input | length stepAll == 0 = (n, input)
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| otherwise = compute' (scoreAdd n $ score stepAll) stepAll alterAll
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where
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alterAll :: Input
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alterAll = L.foldl' alterOne input signals
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alterOne :: Input -> (String, Pulse, String) -> Input
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alterOne acc (prev, p, me) = alter p prev me acc (M.lookup me input)
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alter :: Pulse -> String -> String -> Input -> Maybe Conf -> Input
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alter _ _ _ input (Just (Normal, _)) = input
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alter High _ _ input (Just (FlipFlop _, _)) = input
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alter Low _ me input (Just (FlipFlop False, l)) = M.insert me (FlipFlop True, l) input
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alter Low _ me input (Just (FlipFlop True, l)) = M.insert me (FlipFlop False, l) input
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alter p prev me input (Just (Conjunction m, l)) = M.insert me (Conjunction $ M.insert prev p m, l) input
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alter p _ _ input (Just (Broadcaster, l)) = input
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alter _ _ _ input Nothing = input
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score :: [(String, Pulse, String)] -> (Int, Int)
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score = L.foldl' scoreOne (0, 0)
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scoreOne :: (Int, Int) -> (String, Pulse, String) -> (Int, Int)
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scoreOne (x, y) (_, Low, _) = (x + 1, y)
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scoreOne (x, y) (_, High, _) = (x, y + 1)
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stepAll :: [(String, Pulse, String)]
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stepAll = L.foldl' stepOne [] signals
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stepOne :: [(String, Pulse, String)] -> (String, Pulse, String) -> [(String, Pulse, String)]
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stepOne acc (prev, p, s) = step p prev s acc (M.lookup s input)
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step :: Pulse -> String -> String -> [(String, Pulse, String)] -> Maybe Conf -> [(String, Pulse, String)]
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step _ _ _ acc (Just (Normal, _)) = acc
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step High _ _ acc (Just (FlipFlop _, _)) = acc
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step Low _ me acc (Just (FlipFlop False, l)) = acc ++ map (set me High) l
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step Low _ me acc (Just (FlipFlop True, l)) = acc ++ map (set me Low) l
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step p prev me acc (Just (Conjunction m, l)) = let p2 = if length (M.filter (\x -> x == High) $ M.insert prev p m) == length m then Low else High
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in acc ++ map (set me p2) l
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step p _ me acc (Just (Broadcaster, l)) = acc ++ map (set me p) l
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step _ _ _ acc Nothing = acc
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initConjuctions :: Input -> Input
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initConjuctions input = let r = M.foldrWithKey initConf input input in r
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initConf :: String -> Conf -> Input -> Input
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initConf c (_, l) input = L.foldl' initOne input l
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where
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initOne :: Input -> String -> Input
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initOne input s = case M.lookup s input of
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Just (Conjunction m, l) -> M.insert s (Conjunction (M.insert c Low m), l) input
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_ -> input
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scoreAdd (x, y) (x', y') = (x + x', y + y')
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set :: String -> Pulse -> String -> (String, Pulse, String)
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set me p s = (me, p, s)
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main :: IO ()
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main = do
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example <- parseInput "example"
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let exampleOutput = compute example
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when (exampleOutput /= exampleExpectedOutput) (error $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput)
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example2 <- parseInput "example2"
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let example2Output = compute example2
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when (example2Output /= example2ExpectedOutput) (error $ "example2 failed: got " ++ show example2Output ++ " instead of " ++ show example2ExpectedOutput)
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input <- parseInput "input"
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print $ compute input
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