prefix = span style="font-family / 已知P 结点是某双向的中间结点,试从下列提供的语句中选出合适的语句序列,完成下面的操作。 1、 在P 结点后插入S 结点:( ) 2、 在P 结点前插入S 结点:( ) 3、 删除P 结点的直接后继结点:( ) 4、 删除P 结点的直接前驱结点:( ) 5、 删除P 结点:( ) (1) P->next =P->next->next; (2) P->prior= P->prior->prior; (3)P->next =S; (4)P->prior= S; (5)S->next =P; (6)S->prior= P; (7)S->next =P->next; (8)S->prior= P->prior; (9)P->prior->next= P->next; (10)P->prior->next = P; (11) P->next->prior = P; (12) P->next->prior = S; (13)P->prior->next = S; (14)P->next->prior = P->prior; (15) Q =P->next; (16) Q =P->prior; (17) free(P); (18) free(Q);