day_13.rb

data = File.read(ARGV[0]).split("\n").map { |l| l.split(": ").map(&:to_i) }

layers = {}

data.each do |a, b|
  layers[a] = b
end

max = ARGV[1].to_i

t = 0
i = 0
score = 0

while i <= max do
  l = layers[i]

  if l
    thingy = (l - 1) * 2
    if t % thingy == 0
      score += i * l
    end
  end

  i += 1
  t += 1
end
puts "Star 1 #{score}"


delay = 0

loop do
  delay += 1

  t = delay
  i = 0
  caught = false

  while i <= max do
    l = layers[i]

    if l
      thingy = (l - 1) * 2
      if t % thingy == 0
        caught = true
        break
      end
    end

    i += 1
    t += 1
  end

  unless caught
    puts "Star 2 #{delay}"
    exit
  end
end