A Linear-Space Data Structure for Range-LCP Queries in Poly-Logarithmic Time
A Linear-Space Data Structure for Range-LCP Queries in Poly-Logarithmic Time
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多对数时间内范围LCP查询的线性空间数据结构
DOI:
10.1007/978-3-319-94776
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Thankachan, S. V.
中科院分区:
文献类型:
--
作者:
Abedin, P.;Ganguly, A.;Hon, W. K.;Nekrich, Y.;Sadakane, K.;Shah, R.;Thankachan, S. V.
Abstract Let T [1, n] be a text of length n and T [i, n] be the suffix starting at position i. Also, for any two strings X and Y, let LCP (X, Y) denote their longest common prefix. The range-LCP of T wrt a range [α, β], where 1≤ α< β≤ n is rlcp (α, β)= max{| LCP (T [i, n], T [j, n])|| i≠ j a n d i, j∈[α, β]} Amir et al.[2] introduced the indexing version of this problem, where the task is to build a data structure over T, so that rlcp (α, β) for any query range [α, β] can be reported efficiently. They proposed an O (n log 1+ ϵ n) space structure with query time O (log log n), and a linear space (ie, O (n) words) structure with query time O (δ log log n), where δ= β− α+ 1 is the length of the input range and ϵ> 0 is an arbitrarily small constant. Later, Patil et al.[5] proposed another linear space structure with an improved query time of O (δ log ϵ δ). This poses an interesting question, whether it is possible to answer rlcp (⋅,⋅) queries in poly-logarithmic time using a linear space data structure. In this paper, we settle this question by presenting an O (n) space data structure with query time O (log 1+ ϵ n) and construction time O (n log n).
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影响因子:
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