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Consider a double-ended queue with elements 31, 17, 4, 22, 19, 8. What is the time complexity of deletion of last element i.e. 8 and insertion of new element 10 at the rear?
  • a)
    O(1), O(1)
  • b)
    O(n), O(1)
  • c)
    O(1), O(n)
  • d)
    O(n), O(n)
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Consider a double-ended queue with elements 31, 17, 4, 22, 19, 8. What...
In a double-ended queue, elements can be inserted and deleted from both the front and back of the queue.
Time complexity of all operations like insert element at front, insert at rear, delete element from front, and delete element from rear is O(1).
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Most Upvoted Answer
Consider a double-ended queue with elements 31, 17, 4, 22, 19, 8. What...
Explanation:

  • A double-ended queue is also known as Deque. It allows insertion and deletion of elements from both ends.

  • The given elements are: 31, 17, 4, 22, 19, 8.

  • To delete the last element (8) from the deque, we need to perform the following steps:


    • Check if the deque is empty or not.

    • If not empty, remove the last element (8).


  • The time complexity of deletion of the last element is O(1) because we are directly removing the last element from the deque.

  • To insert a new element (10) at the rear, we need to perform the following steps:


    • Check if the deque is full or not.

    • If not full, insert the new element (10) at the rear.


  • The time complexity of insertion at the rear is O(1) because we are directly inserting the new element at the rear of the deque.

  • Hence, the time complexity of deletion of the last element and insertion of a new element at the rear is O(1), O(1).

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Consider a double-ended queue with elements 31, 17, 4, 22, 19, 8. What is the time complexity of deletion of last element i.e. 8 and insertion of new element 10 at the rear?a)O(1), O(1)b)O(n), O(1)c)O(1), O(n)d)O(n), O(n)Correct answer is option 'A'. Can you explain this answer?
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