Solution: Valid Palindrome
Understand how to verify a valid palindrome by using two pointers to scan a string from both ends, ignoring non-alphanumeric characters and performing case-insensitive comparisons. Learn to apply this efficient method with O(n) time complexity and constant space complexity to solve palindrome validation problems.
Statement
Given a string, s, return TRUE if it is a palindrome; otherwise, return FALSE.
A phrase is considered a palindrome if it reads the same backward as forward after converting all uppercase letters to lowercase and removing any characters that are not letters or numbers. Only alphanumeric characters (letters and digits) are taken into account.
Constraints:
s.length...