--- /dev/null
+import Text.Parsec hiding (State)
+import Data.Text (pack, unpack, toTitle)
+import Control.Monad.State.Lazy
+import Data.List (partition, findIndices, sort, find)
+import Data.Maybe (fromJust)
+
+data Destination = Bot | Output deriving (Show, Read, Eq)
+-- Rule bot low-destination high-destination
+-- Gift bot value
+data Instruction = Rule { ruleId :: Int
+ , lowDestType :: Destination
+ , lowDestId :: Int
+ , highDestType :: Destination
+ , highDestId :: Int
+ } |
+ Gift { giftId :: Int
+ , value :: Int
+ }
+ deriving (Show)
+
+-- bod id [item1, item2]
+data Place = Place { placeId :: Int
+ , placeType :: Destination
+ , items :: [Int]}
+ deriving (Show)
+
+-- delivery by bot of low-value and high-value
+data Event = Delivery { deliveryId :: Int
+ , lowDelivery :: Int
+ , highDelivery :: Int
+ } |
+ Update { updateId :: Int
+ , updateType :: Destination
+ , updateItem :: Int
+ } deriving (Show)
+
+type Factory = ([Place], [Instruction], [Event])
+-- data FactorySt History = FactorySt (Factory -> (Factory, History))
+
+emptyFactory :: Factory
+emptyFactory = ([], [], [])
+
+main :: IO ()
+main = do
+ text <- readFile "data/advent10.txt"
+ let instructions = successfulParse $ parseIfile text
+ part1 instructions
+ part2 instructions
+
+
+part1 :: [Instruction] -> IO ()
+part1 instructions =
+ do let (_, _, events) = snd $ runState (runFactory instructions) emptyFactory
+ -- let (places, instructions, events) = snd finalFactory
+ print $ deliveryId $ fromJust $ findDelivery events 17 61
+
+part2 :: [Instruction] -> IO ()
+part2 instructions =
+ do let (places, _, _) = snd $ runState (runFactory instructions) emptyFactory
+ let outs = findOutputs places [0, 1, 2]
+ let product = foldl1 (*) $ concatMap (items) outs
+ print $ product
+
+
+findDelivery :: [Event] -> Int -> Int -> Maybe Event
+findDelivery events lowItem highItem = find (delivery) events
+ where delivery Update {} = False
+ delivery Delivery {deliveryId = bot, lowDelivery = l, highDelivery = h}
+ | l == lowItem && h == highItem = True
+ | otherwise = False
+
+findOutputs :: [Place] -> [Int] -> [Place]
+findOutputs outputs ids = filter (interesting) outputs
+ where interesting Place {placeId = p, placeType = t, items = i}
+ | (p `elem` ids) && t == Output = True
+ | otherwise = False
+
+
+runFactory :: [Instruction] -> State Factory ()
+runFactory instructions = do
+ addInstructions instructions
+ runInstructions instructions
+
+
+
+instructionFile = instructionLine `endBy` newline
+instructionLine = ruleL <|> giftL
+
+
+ruleL =
+ do (string "bot" >> spaces)
+ bot <- many1 digit
+ (spaces >> string "gives low to" >> spaces)
+ lowDestType <- (string "output" <|> string "bot")
+ spaces
+ lowDest <- many1 digit
+ (spaces >> string "and high to" >> spaces)
+ highDestType <- (string "output" <|> string "bot")
+ spaces
+ highDest <- many1 digit
+ let rule = Rule (read bot)
+ (read $ unpack $ toTitle $ pack lowDestType)
+ (read lowDest)
+ (read $ unpack $ toTitle $ pack highDestType)
+ (read highDest)
+ return rule
+
+giftL =
+ do (string "value" >> spaces)
+ value <- many1 digit
+ (spaces >> string "goes to bot" >> spaces)
+ bot <- many1 digit
+ let gift = Gift (read bot) (read value)
+ return gift
+
+
+parseIfile :: String -> Either ParseError [Instruction]
+parseIfile input = parse instructionFile "(unknown)" input
+
+parseIline :: String -> Either ParseError Instruction
+parseIline input = parse instructionLine "(unknown)" input
+
+successfulParse :: Either ParseError [a] -> [a]
+successfulParse (Left _) = []
+successfulParse (Right a) = a
+
+
+
+
+addInstructions :: [Instruction] -> State Factory ()
+addInstructions [] = return ()
+addInstructions (i:is) = do
+ addInstruction i
+ addInstructions is
+
+
+addInstruction :: Instruction -> State Factory ()
+addInstruction r@(Rule {lowDestType = ld, lowDestId = li,
+ highDestType = hd, highDestId = hi}) =
+ do (places, rules, history) <- get
+ put (places, r:rules, history)
+ addPlace (Place {placeType = ld, placeId = li, items = []})
+ addPlace (Place {placeType = hd, placeId = hi, items = []})
+addInstruction Gift {giftId = g} =
+ do addPlace (Place {placeType = Bot, placeId = g, items = []})
+
+
+addPlace :: Place -> State Factory ()
+addPlace place =
+ do (places, rules, history) <- get
+ if not $ placeElem place places
+ then put ((place:places), rules, history)
+ else return ()
+
+
+runInstructions :: [Instruction] -> State Factory ()
+runInstructions [] = return ()
+runInstructions (i:is) =
+ do runInstruction i
+ runInstructions is
+
+
+runInstruction :: Instruction -> State Factory ()
+runInstruction Rule {} = return ()
+runInstruction g@(Gift {}) =
+ do updatePlace (giftId g) Bot (value g)
+ propogateUpdates
+
+updatePlace :: Int -> Destination -> Int -> State Factory ()
+updatePlace b d i =
+ do (places, instructions, events) <- get
+ let (place0s, otherPlaces) = partition (samePlace (Place {placeId = b, placeType = d, items = []})) places
+ let place = head place0s
+ let place' = place {items = i:(items place)}
+ let update = Update {updateId = b, updateType = d, updateItem = i}
+ put (place':otherPlaces, instructions, update:events)
+
+
+propogateUpdates :: State Factory ()
+propogateUpdates =
+ do (places, instructions, events) <- get
+ let (fullBots, otherPlaces) = fullRobots places
+ if (not . null) fullBots
+ then do let fullBot = head fullBots
+ let maybeRule = findRule instructions (placeId fullBot)
+ case maybeRule of
+ Nothing -> propogateUpdates
+ Just rule -> do let small:large:_ = sort $ items fullBot
+ let emptyBot = fullBot {items = []}
+ let delivery = Delivery { deliveryId = placeId fullBot
+ , lowDelivery = small
+ , highDelivery = large
+ }
+ put (emptyBot:(tail fullBots) ++ otherPlaces,
+ instructions,
+ delivery:events)
+ updatePlace (lowDestId rule) (lowDestType rule) small
+ updatePlace (highDestId rule) (highDestType rule) large
+ propogateUpdates
+ else return ()
+
+
+placeElem :: Place -> [Place] -> Bool
+placeElem place places = (not . null) $ findIndices (samePlace place) places
+
+samePlace :: Place -> Place -> Bool
+samePlace p1 p2 = (placeId p1 == placeId p2) && (placeType p1 == placeType p2)
+
+fullRobots :: [Place] -> ([Place], [Place])
+fullRobots places = partition (\p -> placeType p == Bot && length (items p) >= 2) places
+
+findRule :: [Instruction] -> Int -> Maybe Instruction
+findRule instructions bot = find ruleForBot instructions
+ where ruleForBot Gift {} = False
+ ruleForBot Rule {ruleId = b}
+ | b == bot = True
+ | otherwise = False
projects / advent-of-code-16.git / blobdiff