Valid Parentheses - Leetcode 20 Explained 🔥 Stack - Python (Brute-Force to Optimized)

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Beginner-Friendly Walkthrough! 🚀
In this video, I’ll walk you through LeetCode 20: Valid Parentheses, starting from a brute-force approach and moving into an optimized stack-based solution, with coding in Python.

I’ll explain how the stack and LIFO concepts apply, break down the time and space complexity, and also talk about why using a hashmap for bracket mapping doesn’t change performance.

🔗 Problem & Solution Links for Leetcode 20. Valid Parentheses
🌱 DKodeTree Roots 25 (Essential Beginner-Friendly LeetCode Problems):

⏱️ Timestamps
00:00 - Understanding the Problem
01:55 - Brute-force Approach
03:45 - Time & Space Complexity (Brute-force Approach)
04:24 - Stack & LIFO Explained Simply
05:23 - Optimized Stack-Based Solution
07:39 - Using HashMap for Mapping: Does It Affect Complexity?
08:17 - Final Time & Space Complexity (Stack Approach)
08:48 - Python Code Walkthrough (Optimized)

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  6. leetcode 20 valid parentheses python
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