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【单选题】
设循环队列中数组的下标范围是 0 ~ n –1 ,其头尾指针分别为 f 和 r ,则其元素个数为 ( )A.
r – f
B.
r – f + 1
C.
( r – f ) mod n + 1
D.
( r – f + n ) mod n
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