Top-k document retrieval in optimal space

被引：13
|
作者：
Tsur, Dekel [1 ]
机构：
[1] Ben Gurion Univ Negev, Dept Comp Sci, IL-84105 Beer Sheva, Israel
来源：
INFORMATION PROCESSING LETTERS | 2013年 / 113卷 / 12期
关键词：
Data structures; Document retrieval; Text indexing; EFFICIENT ALGORITHMS; STRING RETRIEVAL;
D O I：
10.1016/j.ipl.2013.03.012
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
We present an index for top-k most frequent document retrieval whose space is vertical bar CSA vertical bar + o(n) + Dlog n/D + O(D) bits, and its query time is O (logk log(2+epsilon) n) per reported document, where D is the number of documents, n is the sum of lengths of the documents, and vertical bar CSA vertical bar is the space of the compressed suffix array for the documents. This improves over previous results for this problem, whose space complexities are vertical bar CSA vertical bar + omega(n) or 2 vertical bar CSA vertical bar + omega(1). (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：440 / 443
页数：4
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