带头结点的单链表head为空的判断条件是______。A.head=NILB.head->next=NILC.head->next=headD.head<>NIL

带头结点的单链表head为空的判断条件是______。

A.head=NIL

B.head->next=NIL

C.head->next=head

D.head<>NIL


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