In this problem, we solve LeetCode Problem 20: Valid Parentheses.
You are given a string containing only parentheses characters ()[]{} and need to check whether the string is valid.
A string is valid if:
Every opening bracket has a matching closing bracket
Brackets are closed in the correct order
No unmatched brackets remain
What this solution covers:
✔ Simple stack-based logic
✔ Matching opening and closing brackets
✔ Easy Java & Python implementation
✔ Beginner-friendly explanation
✔ One of the most common interview questions
This problem is a classic example of using a stack data structure and is frequently asked in coding interviews.
Practice it on LeetCode 🚀
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