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• 0125. Valid Palindrome
  • Approach
  • Python
  • C++

TODO 0125. Valid Palindrome   easy

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/.

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.
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.

TODO Approach

Write your approach here.

TODO Python

class Solution:
    def isPalindrome(self, s: str) -> bool:

TODO C++

class Solution {
public:
    bool isPalindrome(string s) {
        
    }
};