q=q->next;p=q->next;q->next=p->next
A.1 B.1/2 C.2 D.4
A.V1V2V4V8V5V3V6V7 B.V1V2V4V5V8V3V6V7 C.V1V2V4V8V3V5V6V7 D.V1V3V6V7V2V4V5V8
A.8 B.10 C.72 D.74