有容量为MAXSIZE的循环顺序队列cq，头指针front，尾指针rear，队空的条件是，队满的条件是。
已知链队列Q的头、尾指针分别是front和rear，则出队操作是：p=Q->front;;free(p);
What happens on the day before the sports day?
A. Many people wear colored clothes.
B. The sports field is well prepared for the special event.
C. People are having a big festival.
Who arrive at the sports field first?
A. The students and teachers.
B. The students' parents.
C. The special guests.
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