Created
May 22, 2020 20:57
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Subway Trees
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{-# LANGUAGE OverloadedStrings #-} | |
import Control.Arrow | |
import Data.List | |
import Data.Maybe | |
import Control.Applicative | |
import Data.Attoparsec.ByteString.Char8 | |
import qualified Data.ByteString.Char8 as C | |
import qualified ScannerBS as S | |
data Subway = Subway [Subway] | |
deriving (Show,Ord,Eq) | |
cannonical :: Subway -> Subway | |
cannonical (Subway xs) = Subway $ sort (map cannonical xs) | |
parseSubway :: Parser Subway | |
parseSubway = Subway <$> (string "0" *> many parseSubway <* string "1") | |
str2sub :: C.ByteString -> Subway | |
str2sub s = fromJust $ maybeResult $ parse parseSubway (C.cons '0' (C.snoc s '1')) | |
main :: IO () | |
main = C.interact $ | |
S.runScanner (S.numberOf (S.two S.str)) | |
>>> map solve >>> C.unlines | |
solve :: [C.ByteString] -> C.ByteString | |
solve = (["","same","different"] !!) . length . group . map (cannonical . str2sub) |
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Great insight. Thank you!