复杂链表的复制

标签：链表   指针   

题目: 　　

实现函数ComplexListNode* Clone(ComplexListNode* pHead), 复制一个复杂链表．在复杂链表中，每个结点除了有一个m_pNext指针指向下一个结点外，还有一个m_pSibling指向链表中的任意结点或者NULL.结点定义如下：

struct ComplexListNode
{
      int              m_nValue;
      ComplexListNode*    m_pNext;
      ComplexListNode*    m_pSibling;
};

如图，虚线为m_pSibling指针，没显示的表示指向NULL.

思路：

１．　　　从头结点开始复制每个结点，并且把每个结点连在当前结点后面．

２．　修改克隆结点的m_pSibling指针

３．　拆链表，反回克隆链表的头指针

//复制原始链表的每个结点．并且新的结点都连到原始链表当前结点的后面
//新节点的m_pSibling先置空
void CloneNodes(ComplexListNode* pHead)
{
	if (pHead == NULL)
		return;
	ComplexListNode* pNow = pHead;
	while (pNow)
	{
		ComplexListNode* pClone = new ComplexListNode(0);
		pClone->m_pNext = pNow->m_pNext;
		pClone->m_pSibling = NULL;
		pNow->m_pNext = pClone;
		pNow = pClone->m_pNext;
	}
}

//克隆m_pSibling
void CloneSibling(ComplexListNode* pHead)
{
	ComplexListNode* pNow = pHead;
	while (pNow)
	{
		ComplexListNode* pClone = pNow->m_pNext;
		if (pNow->m_pSibling)
		{
			pClone->m_pSibling = pNow->m_pSibling->m_pNext;
		}
		pNow = pClone->m_pNext;
	}
}

//拆链表,返回新链表
ComplexListNode* ReconnectNodes(ComplexListNode* pHead)
{
	ComplexListNode* pNow = pHead;
	ComplexListNode* pCloneHead = NULL;
	ComplexListNode* pClone = NULL;
	if (pNow)
	{
		pCloneHead = pNow->m_pNext;
		pClone = pNow->m_pNext;
		pNow->m_pNext =  pClone->m_pNext;
		pNow = pNow->m_pNext;
	}

	while (pNow)
	{
		pClone->m_pNext = pNow->m_pNext;
		pClone  = pClone->m_pNext;
		pNow->m_pNext =  pClone->m_pNext;
		pNow = pNow->m_pNext;
		
	}

	return pCloneHead;

}

ComplexListNode* Clone(ComplexListNode* pHead)
{
	CloneNodes(pHead);	
	CloneSibling(pHead);
	ComplexListNode* pChead = ReconnectNodes(pHead);
	return pChead;
}

复杂链表的复制

标签：链表   指针   

原文地址：http://blog.csdn.net/nizhannizhan/article/details/47983455