You should use this package instead of an array if you do a lot of Array#push() and Array#shift() on large arrays, since Array#shift() has linear time complexity O(n) while Queue#dequeue() has ...
ENQUEUE: FRONT is set to 0, REAR is circularly incremented by 1, if it reaches the end, it would be at the start of the queue, then add to the position pointed to by REAR. DEQUEUE: Return value ...
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