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day16/haskell: readability improvements

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Xiretza 1 year ago
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deb81d4e12
Signed by: xiretza
GPG Key ID: 17B78226F7139993
  1. 8
      day16/day16.hs

8
day16/day16.hs

@ -53,7 +53,7 @@ parseInput = do
return $ Input {fields, myTicket, otherTickets }
matchesAnyField :: [Field] -> Int -> Bool
matchesAnyField fields n = any (n `S.member`) . map valids $ fields
matchesAnyField fields n = any ((n `S.member`) . valids) fields
iterateUntilNothing :: (a -> Maybe a) -> a -> a
iterateUntilNothing f x = maybe x (iterateUntilNothing f) $ f x
@ -75,10 +75,10 @@ findSingletonChoice (x:xs) =
resolve' :: Ord a => [Resolve a] -> Maybe [Resolve a]
resolve' xs = do
(x, xs') <- findSingletonChoice xs
return $ map (dropChoice x) xs'
(r, xs') <- findSingletonChoice xs
return $ map (dropChoice r) xs'
where dropChoice x (Choice s) = Choice (S.delete x s)
dropChoice _ r = r
dropChoice _ y = y
part1 :: Input -> Int
part1 Input { fields, otherTickets } = sum . filter (not . matchesAnyField fields) . concat $ otherTickets

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