Valid Palindrome - LeetCode 125 | Day 6 of My Coding Journey

🎯 Day 6 of My LeetCode Journey | Valid Palindrome Problem

In this video, I solve LeetCode Problem #125 - Valid Palindrome, an easy-level problem that introduces the powerful Two Pointer technique! This is a fundamental problem that appears frequently in coding interviews.

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

📌 PROBLEM DESCRIPTION:
A phrase is a palindrome if, after converting all uppercase letters into lowercase letters and removing all non-alphanumeric characters, it reads the same forward and backward.

Given a string s, return true if it is a palindrome, or false otherwise.

Example 1:
Input: s = "A man, a plan, a canal: Panama"
Output: true
Explanation: "amanaplanacanalpanama" is a palindrome.

Example 2:
Input: s = "race a car"
Output: false
Explanation: "raceacar" is not a palindrome.

Example 3:
Input: s = " "
Output: true
Explanation: Empty string after removing non-alphanumeric characters is a palindrome.

💡 KEY CONCEPTS COVERED:
✅ Two Pointer Technique
✅ String Manipulation
✅ Character Validation (Alphanumeric)
✅ Case Insensitive Comparison
✅ In-place Algorithm

📊 COMPLEXITY:
• Time Complexity: O(n)
• Space Complexity: O(1)

🎓 DIFFICULTY: Easy
🏷️ TOPICS: Two Pointers, String

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📚 MY LEETCODE JOURNEY PLAYLIST:
   • Leetcode  

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

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