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Q.rear-Q.front==m Q.rear!=Q.front Q.front==(Q.rear+1)%m Q.front==Q.rear%m+1
rear+1==Q.front rear==Q.front+1 rear==Q.front (Q.rear+1)%m==Q.front
r-f (r-f+m)%m r-f+1 (r-f+m)%m+1
rear=0 (rear+1)mod m=0 length=0 length+1=0
(rear-front+m)%m read-front+1 read-front-1 read-front
(rear—front+m)MOD m rear—front+1 rear—front—1 rear—front
(rear-front+m) MOD m rear-front+1 rear-front-1 rear-front
(front-rear+1)%m (rear-front+1)%m (front-rear+m)%m (rear-front+m)%m
(front-rear+1)%m (rear-front+1)%m (front-rear+m)%m (rear-front+m)%m
(rear-front+m)%m read-front+1 read-front-1 read-front
(rear-front+N+1)mod N (rear-front+1)mod N (rear-front-1+mod N (rear-fronmod N
rear-length (rear-length+m)mod m (1+rear+m-length)mod m m-length
(rear-front+mod m (rear-front+1)mod m (rear-front-1+mod m (rear-fronmod m
(rear-front+m)mod m (real-front+1)mod m (rear-front-1+m)mod m (rear-front)mod m
rear-length (rear-length+m) MOD m (1+rear+m-length) MOD m m-length
rear-length (rear-length+m) mod m (1+rear+m-length) mod m m-length