Stacks Interview Questions for Freshers
Preparing for your first Stacks interviews? This set is curated for freshers and early-career developers (0–2 years): the 27 questions that come up most for entry-level roles, each with a clear answer, example code and follow-ups.
27 Stacks questions
- 1The 'Valid String' (brackets, braces, parens) problem.Intermediate
- 2Sort a Stack using Recursion.Intermediate
- 3Next Greater Element problem using a Stack.Intermediate
- 4Implement a Stack using two Queues.Intermediate
- 5Convert Infix to Postfix (Shunting-yard algorithm).Intermediate
- 6Implement two Stacks in one Array.Intermediate
- 7Reverse a String/List using a Stack.Intermediate
- 8Balanced Parentheses Check using a Stack.Intermediate
- 9Evaluate Postfix Expression using a Stack.Intermediate
- 10Implement a Min-Stack (getting min in O(1)).Intermediate
- 11Simple Stack implementation in Python.Beginner
- 12Name some common applications of Stacks.Beginner
- 13What is the 'Top' of the stack?Beginner
- 14How do you check if a Stack is empty?Beginner
- 15What is the time complexity of Stack operations?Beginner
- 16Array vs Linked List implementation of a Stack.Beginner
- 17What is Stack Underflow and Overflow?Beginner
- 18Explain LIFO with a real-world example.Beginner
- 19What are the primary operations of a Stack?Beginner
- 20What is a Stack Data Structure?Beginner
- 21Stacks Interview Question 2 (Free)Intermediate
- 22Stacks Interview Question 5 (Free)Intermediate
- 23Stacks Interview Question 4 (Free)Beginner
- 24Stacks Interview Question 1 (Free)Beginner
- 25Stacks Advanced Interview Question 10Beginner
- 26Stacks Advanced Interview Question 8Intermediate
- 27Stacks Advanced Interview Question 7Beginner
Explore more Stacks interview questions
Or browse all Stacks interview questions.
Frequently asked questions
Which Stacks questions do freshers (0–2 years) get asked?
This page collects 27 Stacks interview questions aligned with freshers (0–2 years), ranging across the difficulty levels that match that experience band.
How do I prepare for a Stacks interview with my experience level?
Work through these questions in order, make sure you can explain each answer out loud, and pay attention to the real-world examples and follow-ups — interviewers at this level care as much about reasoning as the final answer.
Do the answers include code and examples?
Yes — answers include explanations, code examples where relevant, common mistakes to avoid and follow-up questions so you are ready for the full interview conversation.