Question: Given a queue with O(1) methods add, remove, and size, what is the big-Oh efficiency of moving the element at the head of the queue

Given a queue with O(1) methods add, remove, and size, what is the big-Oh efficiency of moving the element at the head of the queue to the tail? Of moving the element at the tail of the queue to the head? (The order of the other queue elements should be unchanged.)

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