复杂链表的复制

class Solution {
public:
RandomListNode* Clone(RandomListNode* pHead)
{
if(pHead==NULL) return NULL;
RandomListNode * p=pHead;
while(p!=NULL)
{
RandomListNode *tmp= new RandomListNode(p->label);
tmp->next=p->next;
tmp->random=p->random;
p->next=tmp;
p=p->next->next;
}
p=pHead;
while(p!=NULL&&p->next!=NULL)
{
if(p->next->random)
p->next->random=p->next->random->next;
p=p->next->next;
}
p=pHead;
RandomListNode *cp=pHead->next;
RandomListNode * pn=pHead->next;
while(p!=NULL && pn!=NULL&&pn->next&&pn->next->next)
{
p->next=pn->next;
pn->next=pn->next->next;
p=p->next;
pn=pn->next;

}
p->next=NULL;
return cp;
}
};