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【单选题】
判定一个循环队列Q(最多有n个元素)为空的条件是( )。A.
Q->rear = = Q->front
B.
Q->rear = = Q->front＋l
C.
Q->front= =(Q->rear +1)％n
D.
Q->front= =(Q->rear -1)％n
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举一反三
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