# Linked list example -- short version
class Point
  def initialize(x, y)
    @x = x; @y = y
    self
  end

  def to_s
    sprintf("%d@%d", @x, @y)
  end
end

list1 = [10, 20, Point.new(2, 3), Point.new(4, 5)]
list2 = [20, Point.new(4, 5), list1]
print("list1:\n", list1.join("\n"), "\n")
print("list2:\n", list2.join("\n"), "\n")