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【单选题】
循环队列的队头和队尾指针分别为front和rear,队头指针指向队头元素的前一个位置,队尾指针指向队尾元素,则判断循环队列为空的条件是( )。
A.
front==rear
B.
front==0
C.
rear==0
D.
front=rear+1
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