Valid Parentheses | Parentheses Pattern | Stack Approach | Java Python C++

In this video, we solve the Valid Parentheses problem using stack-based thinking.

This problem checks whether a string of brackets is valid by ensuring every opening bracket has a corresponding closing bracket in the correct order. The key idea is to use a stack to track opening brackets and match them when a closing bracket appears.

We use a single pass approach where we push opening brackets and validate them against closing ones, ensuring correct order and pairing.

What you’ll learn:

How to validate parentheses using stack
Matching and ordering logic
Why stack is the best fit for this problem
Step-by-step intuition and dry run

Time Complexity

Time: O(n)
Space: O(n)

Mastering this pattern will help you solve a wide range of optimization problems efficiently.
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Видео Valid Parentheses | Parentheses Pattern | Stack Approach | Java Python C++ канала RisingBrain