227. Basic Calculator II | Leetcode Unlocked - Python

In this video, we tackle LeetCode 227: Basic Calculator II, a classic string evaluation problem designed to test your parsing skills and understanding of operator precedence. We avoid using the built-in eval function and instead build a robust solution from scratch. First, we explore the intuitive Stack approach to handle multiplication and division priority, then we refine it into an O(1) space optimized solution for maximum efficiency. This tutorial walks through building multi-digit numbers, handling whitespace, and managing state logic in Python, Java, C++, and JavaScript. Perfect for developers preparing for technical interviews who want to master string manipulation and algorithm optimization.

🧋 Support the channel!
My Daily To Do: https://www.mydailytodo.com/
Buy Me A Boba: http://buymeaboba.com/LeetcodeUnlocked
Leetcode Daily: https://www.youtube.com/@LeetcodeDaily-ama

✍️ My Planning Tools (Affiliate Links)
I use a tablet to sketch out data structures and logic before coding. Using these links helps support the channel at no extra cost to you!
Latest S-Pen Tablet: https://amzn.to/4nsgXRw
Great Budget Tablet: https://amzn.to/4ow4v3Y

Perfect for coding interview preparation and improving problem-solving skills.

👍 Like, Subscribe, and Comment! Let me know what problems you'd like to see solved.

Solution Link:
https://leetcode.com/problems/basic-calculator-ii/editorial/

#leetcode #python #algorithms #codinginterview #dailycoding

Видео 227. Basic Calculator II | Leetcode Unlocked - Python канала Leetcode Unlocked