Solution: Valid Palindrome
Discover how to efficiently check if a string is a valid palindrome by using two pointers that traverse the string inward, skipping non-alphanumeric characters and comparing characters case-insensitively. Learn to implement a solution with O(n) time and O(1) space complexity, improving performance over naive methods.
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...