My haskell solution
groups = splitWhen (== "") . lines <$> readFile "./data.txt" part1 = sum . map (length . Set.fromList . intercalate "") <$> groups part2 = sum . map (Set.size . foldl1 Set.intersection . map Set.fromList) <$> groups
Just in 3 lines. It is great.
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My haskell solution
Just in 3 lines. It is great.