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• W3131485968 abstract "In the present work, we tackle the regular language indexing problem by first studying the hierarchy of $p$-sortable languages: regular languages accepted by automata of width $p$. We show that the hierarchy is strict and does not collapse, and provide (exponential in $p$) upper and lower bounds relating the minimum widths of equivalent NFAs and DFAs. Our bounds indicate the importance of being able to index NFAs, as they enable indexing regular languages with much faster and smaller indexes. Our second contribution solves precisely this problem, optimally: we devise a polynomial-time algorithm that indexes any NFA with the optimal value $p$ for its width, without explicitly computing $p$ (NP-hard to find). In particular, this implies that we can index in polynomial time the well-studied case $p=1$ (Wheeler NFAs). More in general, in polynomial time we can build an index breaking the worst-case conditional lower bound of $Omega(|P| m)$, whenever the input NFA's width is $p in o(sqrt{m})$." @default.
• W3131485968 created "2021-03-01" @default.
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• W3131485968 date "2021-02-12" @default.
• W3131485968 modified "2023-09-27" @default.
• W3131485968 title "Which Regular Languages can be Efficiently Indexed" @default.
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