In a stack, which operation is performed in constant time?

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Question: In a stack, which operation is performed in constant time?

Options:

Correct Answer: All of the above

Solution:

All operations (Push, Pop, and Peek) in a stack are performed in constant time, O(1).

In a stack, which operation is performed in constant time?

In a stack, which operation is performed in constant time?

Step 1: Understand what a stack is. A stack is a data structure that follows the Last In, First Out (LIFO) principle.
Step 2: Learn about the main operations of a stack: Push, Pop, and Peek.
Step 3: Push means adding an item to the top of the stack.
Step 4: Pop means removing the item from the top of the stack.
Step 5: Peek means looking at the item on the top of the stack without removing it.
Step 6: Realize that all these operations (Push, Pop, Peek) can be done without needing to look at other items in the stack.
Step 7: Since these operations do not depend on the size of the stack, they are performed in constant time, which is denoted as O(1).

Stack Operations – A stack is a data structure that follows the Last In First Out (LIFO) principle, where the most recently added element is the first to be removed. The main operations are Push (adding an element), Pop (removing the top element), and Peek (viewing the top element without removing it).
Time Complexity – Time complexity is a computational complexity that describes the amount of time it takes to run an algorithm as a function of the length of the input. In the case of stack operations, all three main operations are performed in constant time, O(1).