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;
    }
};