單項(xiàng)選擇題假定一個(gè)循環(huán)順序隊(duì)列的隊(duì)首和隊(duì)尾指針分別為f和r,則判斷隊(duì)空的條件是()

A.f+1==r
B.r+1==f
C.f==0
D.f==r


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