Longest (Sub-)Periodic Subsequence

preprint2022arXivOpen access

We present an algorithm computing the longest periodic subsequence of a string of length $n$ in $O(n^7)$ time with $O(n^4)$ words of space. We obtain improvements when restricting the exponents or extending the search allowing the reported subsequence to be subperiodic down to $O(n^3)$ time and $O(n^2)$ words of space.

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Longest (Sub-)Periodic Subsequence

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