A.24 B.17 C.16 D.23
A.p->next=s;s->next=p->next B.p->next=s->next; C.p=s->next D.s->next=p->next; p->next=s;
A.一對(duì)一B.一對(duì)多C.多對(duì)多D.每一個(gè)元素都有一個(gè)直接前驅(qū)和一個(gè)直接后繼