12 lines
368 B
Haskell
12 lines
368 B
Haskell
{-# LANGUAGE TypeApplications #-}
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import Data.List
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import Data.Maybe
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import Control.Monad
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find_n_summing :: (Num a, Eq a) => a -> Int -> [a] -> Maybe [a]
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find_n_summing to = (find ((to ==) . sum) .) . replicateM
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main = do
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nums <- fmap read <$> lines <$> readFile "input.txt"
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mapM_ print $ product <$> fromJust <$> flip (find_n_summing 2020) nums <$> [2, 3]
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