Practice Valid Palindrome
Read the task, work through the examples, and check your approach against the constraints. Use the original LeetCode task for coding and submissions.
Problem Statement
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.
Source: Valid Palindrome on LeetCode. Use the original task for its coding environment and submissions.
Examples
# Example 1
Input
s = "A man, a plan, a canal: Panama"
Output
true
# Example 2
Input
s = "race a car"
Output
false
# Example 3
Input
s = " "
Output
true
Constraints
1 <= s.length <= 2 * 10^5
s consists only of printable ASCII characters.
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