Day 11 Part 2
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@ -9,7 +9,7 @@ data Monkey =
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{ mID :: Int
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, _items :: [Int]
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, operation :: Int -> Int
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, test :: Int -> Bool
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, test :: Int
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, nextMonkey :: (Int, Int)
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, _inspectCounter :: Int
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}
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@ -35,7 +35,12 @@ main :: IO ()
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main = do
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input <- map (map (splitOn ":") . lines) . splitOn "\n\n" <$> readFile "input"
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let monkes = mapMaybe parseMonkey input
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print $ product $ take 2 $ reverse $ sort $ map _inspectCounter $ last $ take 21 $ iterate turns monkes
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print $ day11 20 (`div` 3) monkes
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print $ day11 10000 id monkes
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day11 :: Int -> (Int -> Int) -> [Monkey] -> Int
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day11 x f m = g $ take (succ x) $ iterate (turns f) m
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where g = product . take 2 . reverse . sort . map _inspectCounter . last
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parseMonkey :: [[String]] -> Maybe Monkey
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parseMonkey [[a, _], [_, b], [_, c], [_, d], [_, e], [_, f]] =
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@ -44,29 +49,29 @@ parseMonkey [[a, _], [_, b], [_, c], [_, d], [_, e], [_, f]] =
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(f' a)
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(read ('[' : b ++ "]"))
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(parseOP $ words c)
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(mtest $ read $ last $ words d)
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(f' d)
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(f' e, f' f)
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0
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where
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f' = read . last . words
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mtest x y = y `mod` x == 0
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parseOP [_, _, _, x, y]
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| y == "old" = (^ 2)
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| y == "old" = (^ (2::Int))
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| x == "*" = (*) (read y)
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| otherwise = (+) (read y)
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parseMonkey _ = Nothing
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turns :: [Monkey] -> [Monkey]
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turns = turns' 0
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turns :: (Int -> Int) -> [Monkey] -> [Monkey]
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turns f = turns' 0
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where turns' n ms
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| length ms == n = ms
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| otherwise = turns' (succ n) monkeNew
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where itemsNew = [ flip div 3 $ operation (ms !! n) x | x<-_items (ms !! n)]
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where itemsNew = [ f $ flip mod modNum $ operation (ms !! n) x | x<-_items (ms !! n)]
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monkeEmptied = ms & ix n .~ ((ms !! n) & items .~ [] & inspectCounter +~ length itemsNew)
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monkeNew = monkeThrow itemsNew n monkeEmptied
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modNum = foldl1 lcm $ map test ms
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monkeThrow :: [Int] -> Int -> [Monkey] -> [Monkey]
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monkeThrow (x:xs) n ms = monkeThrow xs n (ms & ix next .~ ((ms !! next) & items .~ (_items (ms !! next) ++ [x]) ))
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where next = if test (ms !! n) x then fst targets else snd targets
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where next = if mod x (test (ms !! n)) == 0 then fst targets else snd targets
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targets = nextMonkey (ms !! n)
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monkeThrow _ _ ms = ms
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