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Which of the following operations doesn’t take constant time O(1) in Stack ? Answer choicesSelect only one optionREVISITRemoving the elementSearching the elementInserting the elementFinding the topmost element

Question

Which of the following operations doesn’t take constant time O(1) in Stack ? Answer choicesSelect only one optionREVISITRemoving the elementSearching the elementInserting the elementFinding the topmost element

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Solution

The operation that doesn't take constant time O(1) in Stack is "Searching the element".

Here's why:

  1. Removing the element: This operation involves removing the topmost element from the stack. Since the stack follows the Last-In-First-Out (LIFO) principle, the topmost element is always known and can be removed directly. Hence, it takes constant time O(1).

  2. Searching the element: This operation involves searching for an element in the stack. In the worst-case scenario, the element could be at the bottom of the stack, which means all elements would have to be traversed. Hence, it takes linear time O(n), where n is the number of elements in the stack.

  3. Inserting the element: This operation involves adding an element to the top of the stack. Since the position to insert is always known (the top), it takes constant time O(1).

  4. Finding the topmost element: This operation involves returning the topmost element of the stack. Since the topmost element is always known, it takes constant time O(1).

This problem has been solved

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