38 lines
1.6 KiB
Haskell
38 lines
1.6 KiB
Haskell
import Text.Read
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import Data.Char
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hgt (a:b:'i':'n':[]) = (readMaybe [a,b] :: Maybe Int) >>= \a -> return $ a >= 59 && a <= 76
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hgt ('1':b:c:'c':'m':[]) = (readMaybe [b,c] :: Maybe Int) >>= \a -> return $ a >= 50 && a <= 93
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hgt _ = Nothing
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hcl ('#':xs) = return $ all isHexDigit xs
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hcl _ = Nothing
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fields = [("byr", \x -> (readMaybe x :: Maybe Int) >>= \x -> return $ x >= 1920 && x <= 2002)
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,("iyr", \x -> (readMaybe x :: Maybe Int) >>= \x -> return $ x >= 2010 && x <= 2020)
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,("eyr", \x -> (readMaybe x :: Maybe Int) >>= \x -> return $ x >= 2020 && x <= 2030)
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,("hgt", hgt)
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,("hcl", hcl)
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,("ecl", \x -> return $ x `elem` ["amb", "blu", "brn", "gry", "grn", "hzl", "oth"])
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,("pid", \x -> return $ length x == 9 && (readMaybe x :: Maybe Int) /= Nothing)]
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main = readFile "4" >>= putStrLn . show . parse 0 []
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where
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parse :: Integer -> [(String, String)] -> String -> Integer
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parse i lst ('\n':xs) = parse (fin i lst) [] xs
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parse i lst (' ':xs) = parse i lst xs
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parse i lst [] = fin i lst
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parse i lst xs = key i lst "" xs
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key :: Integer -> [(String, String)] -> String -> String -> Integer
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key i lst k (':':xs) = val i lst k "" xs
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key i lst k (x:xs) = key i lst (k ++ [x]) xs
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val :: Integer -> [(String, String)] -> String -> String -> String -> Integer
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val i lst k v (' ':xs) = parse i ((k, v):lst) xs
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val i lst k v ('\n':xs) = parse i ((k, v):lst) xs
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val i lst k v (x:xs) = val i lst k (v ++ [x]) xs
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fin i lst = if all ((==) (Just True))
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$ map (\(x, f) -> lookup x lst >>= f) fields then
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i + 1
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else
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i
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