队空:end1 == end2; 队满:end1 == (end2+1)mod M
队空:end1 == end2; 队满:end2 == (end1+1)mod (M-1)
队空:end2 == (end1+1)mod M; 队满:end1 == (end2+1)mod M
队空:end1 == (end2+1)mod M; 队满:end2 == (end1+1)mod (M-1)
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