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【单选题】
对于一个具有 m 个存储单元的顺序循环队列,设 front 为队头指针, rear 为队尾指针,则该队列中队列元素的个数计算公式为( )。A.
rear-front
B.
(rear-front+m)%m
C.
front-rear
D.
(rear-front)%m
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