Valid Palindrome
📜 Problem Statement: A phrase is a palindrome if, after converting all uppercase letters into lowercase letters and removing all non-alphanumeric characters, it reads the same forward and backward. Alphanumeric characters include letters and numbers.
Given a string s
, return true
if it is a palindrome, or false
otherwise.
Examples
🔹 Example 1:
Input:
Output:
Explanation: "amanaplanacanalpanama" is a palindrome.
🔹 Example 2:
Input:
Output:
Explanation: "raceacar" is not a palindrome.
🔹 Example 3:
Input:
Output:
Explanation: s
is an empty string "" after removing non-alphanumeric characters. Since an empty string reads the same forward and backward, it is a palindrome.
📝 Constraints:
1 <= s.length <= 2 * 10^5
s consists only of printable ASCII characters.
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