juniorStacks
What is the time complexity of Stack operations?
Updated Apr 28, 2026
Short answer
O(1) for push, pop, and peek in most implementations.
Deep explanation
Stacks are fundamental in computer science for managing nested or ordered data. O(1) for push, pop, and peek in most implementations. They ensure that the last item processed is the first one returned, maintaining a strict temporal order.
Real-world example
Back button functionality in a web browser.
Common mistakes
- Forgetting to check for emptiness before popping, causing a runtime error.
Follow-up questions
- What is the space complexity?