30 lines
719 B
Haskell
30 lines
719 B
Haskell
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import Data.List as List
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import Data.Char as Char
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main = do
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putStrLn("Hello")
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issorted :: [Int] -> Bool
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issorted xs = and $ zipWith(<=) xs (tail xs)
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digits :: Int -> [Int]
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digits = map Char.digitToInt . show
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hasAdjacentPair :: [Int] -> Bool
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hasAdjacentPair n = (maximum (map length (List.group n))) >= 2
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hasAdjacentPairb :: [Int] -> Bool
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hasAdjacentPairb n = elem 2 (map length (List.group n))
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day4a :: Int -> Bool
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day4a n =(hasAdjacentPair $ digits n) && ( issorted $ digits n )
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day4b :: Int -> Bool
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day4b n =(hasAdjacentPairb $ digits n) && ( issorted $ digits n )
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filterDay4a :: [Int] -> [Int]
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filterDay4a ns = filter(\n-> day4a n) ns
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filterDay4b :: [Int] -> [Int]
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filterDay4b ns = filter(\n-> day4b n) ns
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