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require "set"
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@programs = Hash[
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ARGF.read.strip
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.lines
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.map {|line| line.scan(/\d+/).map(&:to_i) }
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.map {|x| [x.shift, x] }
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]
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def group(id)
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group = Set.new
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queue = [id]
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until queue.empty?
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program = queue.shift
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next if group.include?(program)
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group << program
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queue = queue.concat(@programs[program])
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end
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group
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end
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p group(0).size
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count = 0
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until @programs.empty?
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group(@programs.keys.first).each do |program|
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@programs.delete(program)
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end
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count += 1
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end
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p count
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