What is the time complexity of pushing an element onto a stack?

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Question: What is the time complexity of pushing an element onto a stack?

Options:

Correct Answer: O(1)

Solution:

Pushing an element onto a stack is done in constant time, hence O(1).

What is the time complexity of pushing an element onto a stack?

What is the time complexity of pushing an element onto 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 what 'pushing' means. Pushing an element onto a stack means adding an item to the top of the stack.
Step 3: Realize that adding an item to the top of the stack does not depend on the number of items already in the stack.
Step 4: Recognize that this operation takes the same amount of time regardless of how many items are in the stack.
Step 5: Conclude that since the time taken to push an element is constant, we say the time complexity is O(1).

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