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125. Valid Palindrome

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

Note: For the purpose of this problem, we define empty string as valid palindrome.

Example 1:

Input: "A man, a plan, a canal: Panama"
Output: true

Example 2:

Input: "race a car"
Output: false

Difficulty:

Easy

Lock:

Normal

Company:

Adobe Amazon Apple Bloomberg Cisco eBay Facebook Google LinkedIn Microsoft Oracle Uber Wayfair Wish Yandex Zenefits

Solution(Chinese):

LEETCODE 125. Valid Palindrome 解题思路分析