如何使用ruby查找第n个节点值

class Node
  attr_accessor :value, :next

  def initialize(value)
    @value = value
    @next = nil
  end
end

class LinkedList
  attr_accessor :head

  def initialize
    @head = nil
  end

  def add(value)
    if @head.nil?
      @head = Node.new(value)
    else
      current = @head
      while current.next
        current = current.next
      end
      current.next = Node.new(value)
    end
  end

  def find_nth_node_value(n)
    return nil if @head.nil?

    current = @head
    count = 1
    while current && count < n
      current = current.next
      count += 1
    end

    current.nil? ? nil : current.value
  end
end

# 创建链表并添加节点
linked_list = LinkedList.new
linked_list.add(1)
linked_list.add(2)
linked_list.add(3)
linked_list.add(4)
linked_list.add(5)

# 查找第n个节点的值
n = 3
value = linked_list.find_nth_node_value(n)
puts "第#{n}个节点的值为：#{value}"