A.(19,21,37,5,2) B.(19,21,5,2,37) C.(19,21,5,37,2) D.(19,21,2,5,37)
A.25 B.10 C.7 D.1
A.n2 B.n2/2 C.n(n+1) D.n(n+1)/2
A.rear-front)%MAX B.rear-front+MAX)%MAX C.rear-front+MAX D.都不对
A.p->next=p->next; B.p->next=p->next->next; C.p->next=p; D.p=p->next;