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【单选题】
在具有n个单元的顺序存储的循环队列中,假定指针front和rear分别指向队首和队尾,则判断队列为空的条件是(38),如果约定“以队尾指针所指位置的下一个位置是队首指针”表示队满,那么队列为且仅当(39)。
A.
front=rear+1
B.
rear=front+1
C.
front=real
D.
front=0
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