class LinkedListNode
  attr_accessor :value, :next_node

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

def print_values(list_node)
  print "#{list_node.value} --> "
  if list_node.next_node.nil?
    print "nil\n"
    return
  else
    print_values(list_node.next_node)
  end
end

def flloyd(list)
    nodea = list.next_node
    nodeb = list.next_node.next_node

    if nodea == nil
        return false
    end

      if nodeb == nodea
       return true
    end

    while nodeb != nil
        nodea = nodea.next_node
        if nodea == nil
            return false
        end

        nodeb = nodeb.next_node.next_node
        if nodea == nodeb
            return true
        end
    end
    return false
end


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

flloyd(node3)