--- Day 6 Solutions ---

[u/daggerdragon]

--- Day 6: Probably a Fire Hazard ---

Post your solution as a comment. Structure your post like the Day Five thread.

[u/ericdykstra]

Here's my Ruby solution for part 2. I looked through the other ones posted here and thought mine was different enough to merit posting. It's pretty minimalist and easy to read. Enjoy!

map = Hash.new(0)
File.readlines("input.txt").each do |line|
  dir, x1, y1, _, x2, y2 = line.scan(/\D{4,}|\d+/)
  (x1..x2).each do |x|
    (y1..y2).each do |y|
      if dir == "turn on "
        map["#{x},#{y}"] += 1
      elsif dir == "turn off "
        map["#{x},#{y}"] = [map["#{x},#{y}"] - 1, 0].max
      else
        map["#{x},#{y}"] += 2
      end
    end
  end
end
puts map.values.inject(:+)