advent-of-code/2015/ruby/day_12.rb

require "json"

class String
  def sum
    0
  end
end

class Integer
  def sum
    self
  end
end

class Array
  def sum
    self.map(&:sum).inject(&:+)
  end
end

class Hash
  def sum
    if self.values.include?("red")
      0
    else
      self.values.map(&:sum).inject(&:+)
    end
  end
end

puts JSON.load(DATA.read).sum

__END__
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