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- W4243924383 abstract "In this paper we consider the problem of finding the approximate nearest neighbor when the data set points are the substrings of a given text T. Specifically, for a string T of length n, we present a data structure which does the following: given a pattern P, if there is a substring of T within the distance R from P, it reports a (possibly different) substring of T within distance cR from P. The length of the pattern P, denoted by m, is not known in advance. For the case where the distances are measured using the Hamming distance, we present a data structure which uses Õ(n1+1/c) space1 and with Õ(n1/c + mno(1)) query time. This essentially matches the earlier bounds of [Ind98], which assumed that the pattern length m is fixed in advance. In addition, our data structure can be constructed in time Õ(n1+1/c + n1+o(1)M1/3), where M is an upper bound for m. This essentially matches the preprocessing bound of [Ind98] as long as the term Õ(n1+1/c) dominates the running time, which is the case when, e.g., c < 3.We also extend our results to the case where the distances are measured according to the l1 distance. The query time and the space bound are essentially the same, while the preprocessing time becomes Õ(n1+1/c + n1+o(1)M2/3)." @default.
- W4243924383 created "2022-05-12" @default.
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- W4243924383 date "2006-01-01" @default.
- W4243924383 modified "2023-10-16" @default.
- W4243924383 title "Efficient algorithms for substring near neighbor problem" @default.
- W4243924383 doi "https://doi.org/10.1145/1109557.1109690" @default.
- W4243924383 hasPublicationYear "2006" @default.
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