Two Pointers • Easy
Valid Palindrome
A phrase is a palindrome if, after converting all uppercase letters into lowercase and removing all non-alphanumeric characters, it reads the same forward and backward.
The Challenge
A phrase is a palindrome if, after converting all uppercase letters into lowercase and removing all non-alphanumeric characters, it reads the same forward and backward.
Pro-tip: Clean the string first, then use two pointers to compare from both ends.
Solution.swift Tests.swift
Output
Ready to run.