Palindrome check

Ignore case and non-alphanumeric.

strings two-pointer

Implement `is_palindrome(s: str) -> bool`.

Ignore case and any character that is not a letter or digit.

Constraints

0 ≤ len(s) ≤ 10^5

Example

>>> is_palindrome("A man, a plan, a canal: Panama")
True
>>> is_palindrome("race a car")
False

8 points ~8 min

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Hints

Filter with isalnum(), lower(), then compare to reversed.

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