72 lines
1.5 KiB
Ruby
72 lines
1.5 KiB
Ruby
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class String
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def to_ip
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IP.new self
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end
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end
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class IP < String
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def initialize(s)
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super s
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end
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def supports_tls?
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!has_abba_in_hypernet_sequences? && has_abba?
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end
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def abba?
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self[0] == self[3] && self[2] == self[1] && self[0] != self[1]
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end
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def has_abba?
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chars.each_cons(4).map(&:join).map(&:to_ip).any?(&:abba?)
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end
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def has_abba_in_hypernet_sequences?
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hypernet_sequences.any? &:has_abba?
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end
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def hypernet_sequences
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supernet_and_hypernet_sequences.each_with_index.select do |seq, i|
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i % 2 == 1
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end.map(&:first)
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end
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def supernet_sequences
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supernet_and_hypernet_sequences.each_with_index.select do |seq, i|
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i % 2 == 0
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end.map(&:first)
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end
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def supernet_and_hypernet_sequences
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split("[").map{ |chunk| chunk.split("]") }.flatten.map(&:to_ip)
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end
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def abas
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@abas ||= chars.each_cons(3).select { |triple| triple[0] == triple[2] && triple[0] != triple[1] }.map(&:join).map(&:to_ip)
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end
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def bab?(abas_to_match)
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abas_to_match.any? { |aba| aba[0] == self[1] && self[0] == aba[1] }
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end
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def babs(abas_to_match)
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abas.select { |aba| aba.bab?(abas_to_match) }
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end
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def supports_ssl?
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supernet_abas = supernet_sequences.map(&:abas).flatten
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hypernet_sequences.any? { |seq| seq.babs(supernet_abas).length > 0 }
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end
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end
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input = STDIN.read.chomp
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lines = input.split("\n").map(&:to_ip)
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part_1 = lines.count(&:supports_tls?)
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puts "Part 1: #{part_1}"
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part_2 = lines.count(&:supports_ssl?)
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puts "Part 2: #{part_2}"
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