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2. Valid Palindrome
Easy
Strings • 40 pts

Valid Palindrome

Easy
Acceptance: 61.8%Topic: Strings
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: s = "A man, a plan, a canal: Panama"
Output: true
Explanation: "amanaplanacanalpanama" is a palindrome.
Example 2:
Input: s = "race a car"
Output: false
Explanation: "raceacar" is not a palindrome.
Example 3:
Input: s = " "
Output: true
Explanation: s is an empty string "" after removing non-alphanumeric characters, which is a palindrome.

Constraints

  • 1 <= s.length <= 2 * 10^5
  • s consists only of printable ASCII characters.
Solution:
solution.js
javascript
13
1
Ln 1, Col 11 lines
UTF-8
Classic Panama palindrome
Input:
["A man, a plan, a canal: Panama"]
Expected Output:
true