单项选择题
A.log2n+1B.log2nC.n/2D.n
A.127B.255C.128D.256
A.rear==n-1B.(front+1)%n==rearC.front==rearD.front==(rear+1)%n
A.r-fB.(m-f-r)%mC.(m+f-r)%mD.(m+r-f)%m
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