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.
Subword Histories and Parikh Matrices
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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.