Implement Stack using Queues | Push vs Pop Expensive | Full Interview Explanation | Python Java C++
In this video, we will solve LeetCode 225: Implement Stack using Queues.
We will understand both important approaches:
✅ Push Expensive Approach
→ Push = O(n)
→ Pop = O(1)
✅ Pop Expensive Approach
→ Push = O(1)
→ Pop = O(n)
Topics covered:
Stack vs Queue intuition
How to simulate LIFO using FIFO
Step-by-step dry run
Time & Space Complexity
Which approach is preferred in interviews
Java implementation explained line by line
This is one of the most important Stack + Queue interview problems for placements and coding interviews.
Perfect for:
DSA interview preparation
Beginners learning stacks & queues
Java interview prep
LeetCode preparation
Mastering this pattern will help you solve a wide range of optimization problems efficiently.
Rising Brain (DSA Sheet):
https://www.risingbrain.org/sheet
Connect with me here:
LinkedIn – / anjalikumari22
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Twitter (X) – https://x.com/anjali1kumari?s=21
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