双链表的插入与删除操作？

//定义插入：s->prior = p->prior;p->prior->next = s;s->next = p;p->prior = s;//第一句必须在第四句之前完成，否则*p的前驱结点就丢掉了。删除：p->prior->next = p->next;p->next->prior = p->prior;free(p)

;//绕过p

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