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If a queue is implemented using two stacks. In enqueue operation, all the elements are pushed from the first stack to the second stack. In dequeue operation pop an element from 1st  stack.
Which of the following is/are true?
  • a)
    Time complexity of enqueue is O(n).
  • b)
     Time complexity of enqueue is O(1).
  • c)
     Time complexity of dequeue is O(1).
  • d)
     Time complexity of dequeue is O(n).
Correct answer is option 'A,C'. Can you explain this answer?
Most Upvoted Answer
If a queue is implemented using two stacks. In enqueue operation, all ...
Enqueue:
While 1st  stack is not empty, push everything from 1st  to 2nd  stack.
Push an element to 1st  stack.
Push everything back to 1st  stack.
Here time complexity will be O(n).
Dequeue:
While 1st  stack is not empty then Pop an item from stack 1 and return it. Here time complexity will be O(1).
Hence, the correct options are (A) and (C).
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If a queue is implemented using two stacks. In enqueue operation, all the elements are pushed from the first stack to the second stack. In dequeue operation pop an element from 1st stack.Which of the following is/are true?a)Time complexity of enqueue is O(n).b)Time complexity of enqueue is O(1).c)Time complexity of dequeue is O(1).d)Time complexity of dequeue is O(n).Correct answer is option 'A,C'. Can you explain this answer?
Question Description
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