A、f+1==r B、r+1==f C、f==0 D、f==r
A、A. front = =rear B、B. (front-1)%n= =rear C、C. (rear+1)%n= =front D、D. (rear-1)%n= = front
A、Q[4] B、Q[5] C、Q[14] D、Q[15]
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