Top Interview 150: Valid Palindrome Challenge
Valid Palindrome problem: remove non-alphanumeric chars, convert to lowercase. Use two pointers to check if string is palindrome. Time complexity O(n), space complexity O(1).
Top Interview 150 The Valid Palindrome problem is a common challenge that tests your ability to process strings and work with character validation. Let’s tackle LeetCode 125: Valid Palindrome step by step. 🚀 Problem Description A phrase is a palindrome if, after: Converting all uppercase letters to lowercase. Removing all non-alphanumeric characters. The phrase reads the same backward as forward. Return true if the input string s is a palindrome; otherwise, return false. 💡 Examples Example 1 Input: s = "A man, a plan, a canal: Panama" Output: true Explanation: Aft...