C#雙向鏈表的查找算法

雙向鏈表是一種鏈表結構，每個節點包含兩個指針，一個指向前一個節點，一個指向后一個節點。雙向鏈表的查找算法可以根據需求進行不同的實現，以下是一個簡單的雙向鏈表查找算法示例：

using System;

class Node
{
    public int data;
    public Node prev;
    public Node next;

    public Node(int data)
    {
        this.data = data;
        this.prev = null;
        this.next = null;
    }
}

class DoublyLinkedList
{
    private Node head;

    public DoublyLinkedList()
    {
        this.head = null;
    }

    public void AddNode(int data)
    {
        Node newNode = new Node(data);
        if (head == null)
        {
            head = newNode;
        }
        else
        {
            Node current = head;
            while (current.next != null)
            {
                current = current.next;
            }
            current.next = newNode;
            newNode.prev = current;
        }
    }

    public Node FindNode(int data)
    {
        Node current = head;
        while (current != null && current.data != data)
        {
            current = current.next;
        }
        return current;
    }

    public void PrintList()
    {
        Node current = head;
        while (current != null)
        {
            Console.Write(current.data + " ");
            current = current.next;
        }
        Console.WriteLine();
    }
}

class Program
{
    static void Main()
    {
        DoublyLinkedList list = new DoublyLinkedList();
        list.AddNode(1);
        list.AddNode(2);
        list.AddNode(3);
        list.AddNode(4);

        list.PrintList();

        Node node = list.FindNode(3);
        if (node != null)
        {
            Console.WriteLine("Node found: " + node.data);
        }
        else
        {
            Console.WriteLine("Node not found");
        }
    }
}

在上面的示例中，定義了一個Node類表示雙向鏈表的節點，包含數據和指向前一個節點和后一個節點的指針。然后定義了DoublyLinkedList類來管理雙向鏈表，包括添加節點、查找節點和打印鏈表等方法。最后在Main方法中進行了簡單的測試。