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@@ -16,10 +16,12 @@ solveA :: [Integer] -> Maybe Integer |
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solveA [] = Nothing |
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solveA xs = Just $ (\(x,y) -> x * y) lsa |
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where |
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lsa = head [ (x,y) | x <- xs, y <- xs, x + y == 2020 ] |
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lsa = if lsa' == [] then error "no answer" else head lsa' |
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lsa' = [ (x,y) | x <- xs, y <- xs, x + y == 2020 ] |
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solveB :: [Integer] -> Maybe Integer |
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solveB [] = Nothing |
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solveB xs = Just $ (\(x,y,z) -> x * y * z) lsb |
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where |
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lsb = head [ (x,y,z) | x <- xs, y <- xs, z <- xs, x + y + z == 2020 ] |
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lsb = if lsb' == [] then error "no answer" else head lsb' |
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lsb' = [ (x,y,z) | x <- xs, y <- xs, z <- xs, x + y + z == 2020 ] |
