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When you delete or peek, only when stackOldestOnTop / dequeueStack is empty should you tranfer from stackNewestOnTop / enqueueStack. And when you insert, you don't need to do the transfer at all.
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Queues: A Tale of Two Stacks
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You don't need to do the transfer every time.
When you delete or peek, only when stackOldestOnTop / dequeueStack is empty should you tranfer from stackNewestOnTop / enqueueStack. And when you insert, you don't need to do the transfer at all.