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2019: Day 6 Part 1

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Jeremy Kaplan 2019-12-06 09:14:15 -08:00
commit 38c2d697c7
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# frozen_string_literal: true
require 'set'
class Body
attr_reader :name, :satellites
def initialize(name)
@name = name
@satellites = []
end
def <<(satellite)
@satellites << satellite
end
def inspect
"<Body #{name}, #{satellites.map(&:name).inspect}>"
end
def to_s
name
end
def direct_orbits
@direct_orbits ||= @satellites.length + @satellites.sum(&:direct_orbits)
end
def indirect_orbits(depth = 0)
@indirect_orbits ||= @satellites.sum do |sat|
depth + sat.indirect_orbits(depth + 1)
end
end
@@registry = {}
def self.get_or_create(name)
if @@registry.key? name
@@registry[name]
else
body = new(name)
@@registry[name] = body
end
end
def self.get(name)
@@registry[name]
end
end
def parse(input)
input.lines.map do |line|
center_name, satellite_name = line.strip.split(')')
center = Body.get_or_create center_name
satellite = Body.get_or_create satellite_name
center << satellite
end
Body.get 'COM'
end
input = File.read(File.join(__dir__, 'input'))
com = parse(input)
puts com.direct_orbits + com.indirect_orbits