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simpler ruby

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a 2020-12-06 15:41:08 -06:00
parent 6ee2030df0
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groups = File.read("input.txt").split("\n\n").map(&:split)
puts groups.map { |group| group.join.chars.uniq.size }.sum # TIL about uniq
puts groups.map { |group| group.map(&:chars).reduce(&:&).size }.sum # TIL you can use & on arrays and not just sets?