k-Link shortest paths in weighted subdivisions

Ovidiu Daescu, Joseph S.B. Mitchell, Simeon Ntafos, James D. Palmer, Chee K. Yap

Research output: Contribution to journalConference article

5 Scopus citations

Abstract

We study the shortest path problem in weighted polygonal subdivisions of the plane, with the additional constraint of an upper bound, k, on the number of links (segments) in the path. We prove structural properties of optimal paths and utilize these results to obtain approximation algorithms that yield a path having O(k) links and weighted length at most (1 + ε) times the weighted length of an optimal k-link path, for any fixed ε > 0. Some of our results make use of a new solution for the 1-link case, based on computing optimal solutions for a special sum-of-fractionals (SOF) problem. We have implemented a system, based on the CORE library, for computing optimal 1-link paths; we experimentally compare our new solution with a previous method for 1-link optimal paths based on a prune-and-search scheme.

Original languageEnglish (US)
Pages (from-to)325-337
Number of pages13
JournalLecture Notes in Computer Science
Volume3608
DOIs
StatePublished - Jan 1 2005
Externally publishedYes
Event9th International Workshop on Algorithms and Data Structures, WADS 2005 - Waterloo, Canada
Duration: Aug 15 2005Aug 17 2005

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Computer Science(all)

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