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【单选题】
设环形队列中数组的下标是0~N-1,已知其队头指针f(f指向队首元素的前个位置)和队中元素个数n,则队尾指针r(r指向队尾元素的位置)为A.
f
B.
(f-n)%N
C.
(f+n)%N
D.
(f+n+1)%N
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