3 lines
251 B
Ruby
3 lines
251 B
Ruby
groups = File.read("input.txt").split("\n\n").map(&:split)
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puts groups.map { |group| group.join.chars.uniq.size }.sum # TIL about uniq
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puts groups.map { |group| group.map(&:chars).reduce(&:&).size }.sum # TIL you can use & on arrays and not just sets? |