day-3.2.rb

Location = Struct.new(:x, :y)

class Santa
  attr_accessor :x, :y

  def initialize
    @x = @y = 0
  end

  def move(char)
    case char
    when '^'
      @y += 1
    when 'v'
      @y -= 1
    when '>'
      @x += 1
    when '<'
      @x -= 1
    end
  end

  def location
    Location.new(@x, @y)
  end

end

location_list = []
location_list << Location.new(0, 0)

santas = [Santa.new, Santa.new]

IO.read('day-3-input.txt').chars.each_with_index do |char, i|
  santa = santas[i%2]
  santa.move(char)
  location_list << santa.location
end

puts location_list.uniq.count