InterviewDigestSystem Design2026-08-13
String manipulation DSA question
AI-Expanded — inferred from the question title, not from the original candidate report
Given a string containing a mix of alphanumeric characters, write a function to determine if it is a valid palindrome by considering only alphanumeric characters and ignoring cases. Your solution should operate in linear time complexity and use constant extra space to handle the input efficiently.
Context & Summary
System design and technical deep dive round
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Conceptual Question
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