题目
A.p->prior=q; q->next=p; p->prior->next=q; q->prior=p->prior;
B.q->prior=p->prior; p->prior->next=q; q->next=p; p->prior=q->next;
C.q->next=p; p->next=q; q->prior->next=q; q->next=p;
D.p->prior->next=q; q->next=p; q->prior=p->prior; p->prior=q;
第1题
A.p->prior=q; q->next=p; p->prior->next=q; q->prior=p->prior;
B.q->prior=p->prior; p->prior->next=q; q->next=p; p->prior=q->next;
C.q->next=p; p->next=q; q->prior->next=q; q->next=p;
D.p->prior->next=q; q->next=p; q->prior=p->prior; p->prior=q;
第2题
A.p->prior=q; q->next=p; p->prior->next=q; q->prior=p->prior;
B.q->prior=p->prior; p->prior->next=q; q->next=p; p->prior=q->next;
C.q->next=p; p->next=q; q->prior->next=q; q->next=p;
D.p->prior->next=q; q->next=p; q->prior=p->prior; p->prior=q;
第6题
A.s->link=p;p->link=s;
B.s->link=p->link;p->link=s;
C.s->link=p->link;p=s;
D.p->link=s;s->link=p;
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