Solution: Valid Palindrome
Discover how to use the two pointer technique to verify if a string is a palindrome. This lesson guides you through a step-by-step approach that filters out non-alphanumeric characters and performs case-insensitive comparisons. By the end, you will understand how to implement a time-efficient solution with constant extra space.
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...