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已知双向链表的每个结点包含两个指针域：prior指向直接前驱结点，next指向直接后继结点。
p->next = s; s->prior = p; p->next->prior = s; s->next = p->next;
s->prior = p; s->next = p->next; p->next = s; p->next->prior = s;
s->prior = p; s->next = p->next; p->next->prior = s; p->next = s;
s->next = p->next; p->next->prior = s; p->next = s; s->prior = p->next;