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Sure you can - O(N). But nobody's gonna expect you to do this in an interview. Even if you do, they'd know that you didn't figure this out but remember it.
- undrai October 02, 2015Better (not in complexity sense) and simpler O(N2) algo: expand around 2N - 1 point of symmetries possible in a string for any palindrome and find the max size out of them.