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The queue data structure is to be realized by using stack. The number of stacks needed would be
  • a)
    It cannot be implemented
  • b)
    2 stacks
  • c)
    4 stacks 
  • d)
    1 stack
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
The queue data structure is to be realized by using stack. The number ...
Method 1 (efficient push):
  • push:
    • enqueue in queue1
  • pop:
    • while the size of queue1 is bigger than 1, pipe dequeued items from queue1 into queue2
    • dequeue and return the last item of queue1, then switch the names of queue1 and queue2
Method 2 (efficient pop):
  • push:
    • enqueue in queue2
    • enqueue all items of queue1 in queue2, then switch the names of queue1 and queue2
  • pop:
    • deqeue from queue1
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Community Answer
The queue data structure is to be realized by using stack. The number ...
Method 1 (efficient push):
  • push:
    • enqueue in queue1
  • pop:
    • while the size of queue1 is bigger than 1, pipe dequeued items from queue1 into queue2
    • dequeue and return the last item of queue1, then switch the names of queue1 and queue2
Method 2 (efficient pop):
  • push:
    • enqueue in queue2
    • enqueue all items of queue1 in queue2, then switch the names of queue1 and queue2
  • pop:
    • deqeue from queue1
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The queue data structure is to be realized by using stack. The number of stacks needed would bea)It cannot be implementedb)2 stacksc)4 stacksd)1 stackCorrect answer is option 'B'. Can you explain this answer?
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