作者: Moses Charikar , Piotr Indyk , Rina Panigrahy
关键词: Range searching 、 Partial match 、 General problem 、 Algorithm 、 Binary logarithm 、 Data structure 、 Combinatorics 、 k-nearest neighbors algorithm 、 Range query (data structures) 、 Mathematics
摘要: We consider the subset query problem, defined as follows: given a set P of N subsets universe U, |U| = m, build data structure, which for any Q ? U detects if there is such that P. This essentially equivalent to partial match problem and fundamental in many areas. In this paper we present first (to our knowledge) algorithms, achieve non-trivial space time bounds m ?(log N). particular, two algorithms with following tradeoffs: - 2O (mlog2 ?c/ log N) space, O(N/2c) time, c Nmc O(mN/c) extend these results more general orthogonal range searching (both exact approximate versions), intersection versions nearest neighbor l?.