Validate palindrome with constraints

Q: Validate palindrome with constraints

This question evaluates a candidate's ability to implement string-processing algorithms and two-pointer techniques under O(n) time and O(1) extra space constraints, including character filtering, case normalization, edge-case handling, and algorithmic complexity analysis.

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Question

Given a string s, return true if s reads the same forward and backward after removing all non-alphanumeric characters and ignoring letter case. Implement an O (n)-time, O( 1)-extra-space solution using two pointers. Follow-ups: (a) Modify your solution to return true if s can become a palindrome after deleting at most one character; (b) Discuss how you would support full Unicode (e.g., combining marks and non-ASCII letters); (c) Provide test cases and analyze complexity.

Validate palindrome with constraints

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