منابع مشابه
Counting Inversions Adaptively
We give a simple and efficient algorithm for adaptively counting inversions in a sequence of n integers. Our algorithm runs in O(n+
متن کاملApproximate counting of inversions in a data
Inversions are used as a fundamental quantity to measure the sortedness of data, to evaluate diierent ranking methods for databases, and in the context of rank aggregation. Considering the volume of the data sets in these applications, the data stream model 16, 2] is a natural setting to design eecient algorithms. We obtain a suite of space-eecient streaming algorithms for approximating the num...
متن کاملNew Results for Adaptive and Approximate Counting of Inversions
Counting inversions is a classic and important problem in databases. The number of inversions, K∗, in a list L = (L(1), L(2), . . . , L(n)) is defined as the number of pairs i < j with L(i) > L(j). In this paper, new results for this problem are presented: 1. In the I/O-model, an adaptive algorithm is presented for calculating K∗. The algorithm performs O( B + N B logM/B( K∗ NB )) I/Os. When K∗...
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An adaptively parallel job is one in which the number of processors which can be used without waste changes during execution. When allocating processors to multiple adap-tively parallel jobs, a job scheduler should attempt to be fair|meaning that no job gets fewer processors than another, unless it demands fewer|and eecient|meaning that the scheduler does not waste processors on jobs that do no...
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ژورنال
عنوان ژورنال: Information Processing Letters
سال: 2015
ISSN: 0020-0190
DOI: 10.1016/j.ipl.2015.05.003