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  • Pros: Avoids Rightward Drift which occurs in naïve array-based queues
  • Let's enqueue 3 items into a queue with max size of 4...
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  • Pros: Avoids Rightward Drift which occurs in naïve array-based queues
  • Now let's dequeue the first item...
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  • Pros: Avoids Rightward Drift which occurs in naïve array-based queues
  • Reason: Items stuck at the end of queue (Rightward Drift)
  • There is no more space after the previous item. We cannot enqueue anymore items, even though there are empty spaces in the queue
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  • Pros: Avoids Rightward Drift which occurs in naïve array-based queues
  • Possible Solution: Shift each items to left after a dequeue occurs
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  • Pros: Avoids Rightward Drift which occurs in naïve array-based queues
  • Problem: Costly especially when dequeuing items at      start of queue / when queue is long
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  • Pros: Avoids Rightward Drift which occurs in naïve array-based queues
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  • Circular array-based queues loops around the circle when enqueuing items
  • Avoids Rightward Drift No Need for Shifting
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