ll3.rb

class LinkedListNode
  attr_accessor :value, :next_node

  def initialize(value, next_node=nil)
    @value = value
    @next_node = next_node
  end
end

def floyd?(list_node)
  tortoise = list_node.next_node 
  hare = list_node.next_node.next_node
  
  while tortoise.value != hare.value
    begin
      tortoise = tortoise.next_node
      hare = hare.next_node.next_node
    rescue
      return false
    end
    
    return true
  end
end

node1 = LinkedListNode.new(37)
node2 = LinkedListNode.new(99, node1)
node3 = LinkedListNode.new(12, node2)
#node1.next_node = node3

puts floyd?(node2)