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已知双向链表的结点结构包含三个部分：数据域data，指向前驱结点的指针prev，指向后继结点的指针next。
① s->prev = p; ② s->next = p->next; ③ if(p->next != NULL) p->next->prev = s; ④ p->next = s;
① p->next = s; ② s->prev = p; ③ s->next = p->next; ④ if(p->next != NULL) p->next->prev = s;
① s->prev = p; ② s->next = p->next; ③ p->next->prev = s; ④ p->next = s;
① s->next = p->next; ② p->next = s; ③ s->prev = p; ④ if(p->next != NULL) p->next->prev = s;