29 lines
861 B
Haskell
29 lines
861 B
Haskell
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import Control.Monad
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import Data.Char
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parseLine :: String -> [[Int]]
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parseLine line = [parseAssignment $ takeWhile (/= ',') line,
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parseAssignment $ drop 1 $ dropWhile (',' /= ) line]
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parseAssignment :: String -> [Int]
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parseAssignment assignment = do
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let first = takeWhile ('-' /=) assignment
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let second = drop 1 $ dropWhile ('-' /=) assignment
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[(read first).. (read second)]
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isIncluded :: [Int] -> [[Int]] -> Bool
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isIncluded current list = any includes list
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where
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includes :: [Int] -> Bool
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includes range' = all (`elem` range') current
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coveredByPartner :: [[Int]] -> Bool
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coveredByPartner [first,second] = isIncluded first [second] || isIncluded second [first]
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main = do
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input <- readFile "four-input.txt"
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let lists= (map (parseLine) $ lines input)
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print $ length $ filter id $ map coveredByPartner lists
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