Valid Parentheses - LeetCode 20 | Day 7 of My Coding Journey

🎯 Day 7 of My LeetCode Journey | Valid Parentheses Problem

In this video, I solve LeetCode Problem #20 - Valid Parentheses, an easy-level problem that introduces the STACK data structure! This is one of the most classic and frequently asked interview questions.

🔗 Problem Link: https://leetcode.com/problems/valid-p...

📌 PROBLEM DESCRIPTION:
Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.

An input string is valid if:
1. Open brackets must be closed by the same type of brackets.
2. Open brackets must be closed in the correct order.
3. Every close bracket has a corresponding open bracket of the same type.

Example 1:
Input: s = "()"
Output: true

Example 2:
Input: s = "()[]{}"
Output: true

Example 3:
Input: s = "(]"
Output: false

Example 4:
Input: s = "([])"
Output: true

Example 5:
Input: s = "([)]"
Output: false

💡 KEY CONCEPTS COVERED:
✅ Stack Data Structure (LIFO - Last In First Out)
✅ Bracket Matching Algorithm
✅ Hash Map for Bracket Pairs
✅ String Traversal
✅ Edge Case Handling

📊 COMPLEXITY:
• Time Complexity: O(n)
• Space Complexity: O(n)

🎓 DIFFICULTY: Easy
🏷️ TOPICS: Stack, String

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📚 MY LEETCODE JOURNEY PLAYLIST:
   • Leetcode  

🤝 CONNECT WITH ME:
• GitHub: https://github.com/ashwinikemshetty
• LinkedIn:   / ashwinikemshetty  

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