单项选择题
A.94,32,40,90,80,46,21,69 B.32,40,21,46,69,94,90,80 C.21,32,46,40,80,69,90,94 D.90,69,80,46,21,32,94,40
A.4 B.5 C.6 D.7
A. P↑.next:=q B.P↑.next:=q;q↑.next:=P↑.next↑.next C. q↑.next:=P↑.next;P↑.next:=q D.P↑.next:=q;q↑.next=P↑.next