Minimum Remove to Make Valid Parentheses | Stack + Greedy Pattern | Java Python C++

In this video, we solve the popular problem Minimum Remove to Make Valid Parentheses using the Stack + Greedy pattern. The goal is to remove the minimum number of invalid parentheses so that the final string becomes valid while preserving the remaining characters in their original order. We first understand the brute force intuition and then move toward the optimized approach using stack-based traversal and greedy validation logic. In this video, you will learn: • Brute force intuition and why it becomes inefficient • How to identify invalid opening and closing brackets • Stack-based optimized approach • Greedy traversal logic for valid parentheses problems • How to mark and remove invalid characters efficiently • Space optimized intuition • Step-by-step dry run with examples • Time and space complexity analysis This problem is extremely important for mastering: • Stack + Greedy pattern • Parentheses validation problems • String manipulation • Interview-based stack questions We also discuss why this problem is different from: • Minimum Add to Make Parentheses Valid • Valid Parentheses • Remove Invalid Parentheses and how to identify which approach to use in interviews. Covered in: Java, Python, and C++ 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   Instagram –   / rbanjali.codes   Twitter (X) – https://x.com/anjali1kumari?s=21