What is the time complexity of clearing all elements from a stack?

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Question: What is the time complexity of clearing all elements from a stack?

Options:

Correct Answer: O(n)

Solution:

Clearing all elements from a stack requires popping each element, leading to a time complexity of O(n).

What is the time complexity of clearing all elements from a stack?

What is the time complexity of clearing all elements from a stack?

Step 1: Understand what a stack is. A stack is a data structure that follows the Last In First Out (LIFO) principle.
Step 2: Know that clearing a stack means removing all elements from it.
Step 3: Realize that to clear a stack, you need to remove each element one by one.
Step 4: Each removal of an element from the stack is called a 'pop' operation.
Step 5: If there are 'n' elements in the stack, you will need to perform 'n' pop operations to clear it.
Step 6: Each pop operation takes constant time, which is O(1).
Step 7: Since you perform 'n' pop operations, the total time taken is n * O(1) = O(n).
Step 8: Therefore, the time complexity of clearing all elements from a stack is O(n).

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