10 lines
328 B
Haskell
10 lines
328 B
Haskell
import Data.Ratio
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closer :: Rational -> Rational -> Rational
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closer curr prev = let goal = (3 % 7) in if curr < goal && (goal - curr) < (goal - prev) then curr else prev
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closest :: Integer -> Rational
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closest bound = foldr closer 0 $ map (\d -> let n = floor (d * 3 % 7) in (n % d)) [8..bound]
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main = print $ closest 1000000
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