Solution: Valid Palindrome
Understand how to apply the two pointer pattern to check if a string is a valid palindrome. This lesson guides you through implementing an optimized approach that skips non-alphanumeric characters, compares characters case-insensitively, and uses constant extra space for efficient processing.
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...