advent 2019 day 12

12.rb

require 'set'
class Blerg

  # test 
  # x repeat is 2028
  # y repeat is 5898
  # z repeat is 4702
  #
  # Actual 
  # x repeat is 
  # y repeat is 231614
  # z repeat is 102356
  def do_it(moons)
    past = Set.new
    moons = moons.lines.map(&:chomp).each_with_index.map do |line|
      Moon.new *line.split(", ").map {|n| n.split("=").last.to_i }
    end

    n = 1
    moons.each {|m| m.xv, m.yv, m.zv = 0, 0, 0}
    #while true
    1_000_000.times do
      past << moons.inspect
      moons.each do |moon|
       moon.xv += moons.count{|m| m.x > moon.x}
       moon.xv -= moons.count{|m| m.x < moon.x}

        #moon.yv += moons.count{|m| m.y > moon.y}
        #moon.yv -= moons.count{|m| m.y < moon.y}

        #moon.zv += moons.count{|m| m.z > moon.z}
        #moon.zv -= moons.count{|m| m.z < moon.z}
      end 
      moons.each do |moon|
        moon.x += moon.xv
    #    moon.y += moon.yv
    #    moon.z += moon.zv
      end
      #print "#{n}..." if n % 1000 == 0
      if past.include? moons.inspect
        past = Set.new
        puts "done: #{n}"
      end
      n += 1
    end
  end

  Moon = Struct.new(:x, :y, :z, :xv, :yv, :zv)
end

Blerg.new.do_it(ARGF.read)

12_demo.txt

<x=-1, y=0, z=2>
<x=2, y=-10, z=-7>
<x=4, y=-8, z=8>
<x=3, y=5, z=-1>

12_demo_2.txt

<x=-8, y=-10, z=0>
<x=5, y=5, z=10>
<x=2, y=-7, z=3>
<x=9, y=-8, z=-3>

12_input.txt

<x=5, y=4, z=4>
<x=-11, y=-11, z=-3>
<x=0, y=7, z=0>
<x=-13, y=2, z=10>