尾部插入节点

struct ListNode
{
	int m_nValue;
	ListNode* m_PNext;
};

void AddToTail(ListNode** pHead, int value)
{
	ListNode *pNew = new ListNode;
	pNew->m_nValue = value;
	pNew->m_PNext =  NULL;

	if(*pHead == NULL)
		*pHead = pNew;
	else
	{
		ListNode* pNOde = *pHead;

		while(pNOde->m_pNext != NULL)
			pNOde = pNOde->m_PNext;
		pNOde->m_pNext = pNew;
	}
}struct ListNode
{
	int m_nValue;
	ListNode* m_P