License: Creative Commons Attribution 3.0 Unported license (CC BY 3.0)
When quoting this document, please refer to the following
DOI: 10.4230/LIPIcs.ICALP.2019.48
URN: urn:nbn:de:0030-drops-106241
URL: https://drops.dagstuhl.de/opus/volltexte/2019/10624/
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Duan, Ran ; Jin, Ce ; Wu, Hongxun

Faster Algorithms for All Pairs Non-Decreasing Paths Problem

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LIPIcs-ICALP-2019-48.pdf (0.5 MB)

Abstract

In this paper, we present an improved algorithm for the All Pairs Non-decreasing Paths (APNP) problem on weighted simple digraphs, which has running time O~(n^{{3 + omega}/{2}}) = O~(n^{2.686}). Here n is the number of vertices, and omega < 2.373 is the exponent of time complexity of fast matrix multiplication [Williams 2012, Le Gall 2014]. This matches the current best upper bound for (max, min)-matrix product [Duan, Pettie 2009] which is reducible to APNP. Thus, further improvement for APNP will imply a faster algorithm for (max, min)-matrix product. The previous best upper bound for APNP on weighted digraphs was O~(n^{1/2(3 + {3 - omega}/{omega + 1} + omega)}) = O~(n^{2.78}) [Duan, Gu, Zhang 2018]. We also show an O~(n^2) time algorithm for APNP in undirected simple graphs which also reaches optimal within logarithmic factors.

BibTeX - Entry

@InProceedings{duan_et_al:LIPIcs:2019:10624,
  author =	{Ran Duan and Ce Jin and Hongxun Wu},
  title =	{{Faster Algorithms for All Pairs Non-Decreasing Paths Problem}},
  booktitle =	{46th International Colloquium on Automata, Languages, and Programming (ICALP 2019)},
  pages =	{48:1--48:13},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-109-2},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{132},
  editor =	{Christel Baier and Ioannis Chatzigiannakis and Paola Flocchini and Stefano Leonardi},
  publisher =	{Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{http://drops.dagstuhl.de/opus/volltexte/2019/10624},
  URN =		{urn:nbn:de:0030-drops-106241},
  doi =		{10.4230/LIPIcs.ICALP.2019.48},
  annote =	{Keywords: graph optimization, matrix multiplication, non-decreasing paths}
}

Keywords: graph optimization, matrix multiplication, non-decreasing paths
Collection: 46th International Colloquium on Automata, Languages, and Programming (ICALP 2019)
Issue Date: 2019
Date of publication: 04.07.2019

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