Approximate matching in the L∞ metric
Approximate matching in the L∞ metric
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DOI:
10.1016/j.ipl.2007.08.012
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发表时间:
2008-02-15
影响因子:
0.5
通讯作者:
Porat, Ely
中科院分区:
文献类型:
--
作者:
Lipsky, Ohad;Porat, Ely
Let a text T =t(0),..., t(n-1) and a pattern P = p(0),...,p(m-1), strings of natural numbers, be given. In the Approximate Matching in the L-infinity metric problem the output is, for every text location i, the L-infinity distance between the pattern and the length m substring of the text starting at i, i.e., Max(j=0)(m-1)vertical bar t(i+j) -p(j)vertical bar. We consider the Approximate k-L-infinity distance problem. Given text T and pattern P as before, and a natural number k the output of the problem is the L-infinity distance of the pattern from the text only at locations i in the text where the distance is bounded by k. For the locations where the distance exceeds k the output is phi. We show an algorithm that solves this problem in O(n(k + log(min(m, vertical bar Sigma vertical bar))) log m) time. (c) 2007 Elsevier B.V. All rights reserved.