【面试题26】复杂链表的复制

【题目描述】

请实现函数ComplexListNode* Clone(ComplexListNode* pHead)。

复制一个复杂链表，每个结点，除了有一个m_pNext指针指向下一个结点，还有一个m_pSibling指向链表中的任意结点或者null。

【解决方案】

方法二：

我的代码实现，仅供参考：

        public static ComplexListNode Clone(ComplexListNode head)
        {
            CloneNode(head);
            ConnectSiblingNodes(head);
            return ReconnectNodes(head);
        }

        /// <summary>
        /// 复制原始链表
        /// </summary>
        /// <param name="head"></param>
        public static void CloneNode(ComplexListNode head)
        {
            ComplexListNode node = head;

            while (node != null)
            {
                ComplexListNode cloneNode = new ComplexListNode();

                cloneNode.Value = node.Value;
                cloneNode.Next = node.Next;

                node.Next = cloneNode;
                node = cloneNode.Next;
            }
        }

        /// <summary>
        /// 设置Sibling
        /// </summary>
        /// <param name="head"></param>
        public static void ConnectSiblingNodes(ComplexListNode head)
        {
            ComplexListNode node = head;

            while (node != null)
            {
                ComplexListNode cloneNode = node.Next;

                if (node.Sibling != null)
                {
                    cloneNode.Sibling = node.Sibling.Next;
                }

                node = cloneNode.Next;
            }
        }

        /// <summary>
        /// 将CloneNode复制出来
        /// </summary>
        /// <param name="head"></param>
        /// <returns></returns>
        public static ComplexListNode ReconnectNodes(ComplexListNode head)
        {
            ComplexListNode node = head;
            ComplexListNode cloneHead = null;
            ComplexListNode cloneNode = null;

            if (node != null)
            {
                cloneHead = cloneNode = node.Next;
                node.Next = cloneNode.Next;
                node = node.Next;
            }

            while (node != null)
            {
                cloneNode.Next = node.Next;
                cloneNode = cloneNode.Next;
                node.Next = cloneNode.Next;
                node = node.Next;
            }

            return cloneHead;
        }