125-ValidPalindrome

Valid Palindrome

Problem can be found in here!

Solution: Two Pointers

def isPalindrome(s: str) -> bool:
    left, right = 0, len(s)-1
    while left < right:
        while left < right and not s[left].isalnum():
            left += 1
        while left < right and not s[right].isalnum():
            right -= 1

        if s[left].lower() != s[right].lower():
            return False

        left += 1
        right -= 1

    return True

Explanation: Please refer to link for explanation.

Time Complexity: , Space Complexity: