The paper introduces minimal and shortest absent subsequences, gives combinatorial characterizations with compact representations, and provides efficient algorithms to test membership and compute the lexicographically smallest ones along with a query data structure.
Absoluteness of subword inequality is undecidable
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2021 1verdicts
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Absent Subsequences in Words
The paper introduces minimal and shortest absent subsequences, gives combinatorial characterizations with compact representations, and provides efficient algorithms to test membership and compute the lexicographically smallest ones along with a query data structure.