A、p->next->prev=p->prev;p->prev->next=p->next;free(p);
B、p->next->prev=p->next;p->prev->next=p->next;free(p);
C、p->next->prev=p->next;p->prev->next=p->prev;free(p);
D、p->next->prev=p->prev;p->prev->next=p->prev;free(p);
A、p->next->prev=p->prev;p->prev->next=p->next;free(p);
B、p->next->prev=p->next;p->prev->next=p->next;free(p);
C、p->next->prev=p->next;p->prev->next=p->prev;free(p);
D、p->next->prev=p->prev;p->prev->next=p->prev;free(p);
A.s=rear;rear=rear->link;deletes;
B.rear=rear->link;deleterear;
C.rear=rear->link->link;deleterear;
D.s=rear->link->link;rear->link->link=s->link;deletes;
A.s->next=p->next;p->next=s;
B.q->next=s;s->next=p;
C.p->next=s->next;s->next=p;
D.p->next=s;s->next=q;
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