Valid Palindrome

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Easy•string•Expected: O(n) time, O(1) space

two-pointers

Problem

Given a string, determine if it is a palindrome considering only alphanumeric characters and ignoring cases.

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.

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