Strategies for hotlink assignments

Prosenjit Bose, Jurek Czyzowicz, Leszek Gąsieniec, Evangelos Kranakis, Danny Krizanc, Andrzej Pelc, Miguel Vargas Martin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

37 Scopus citations


Consider a DAG (directed acyclic graph) G = (V;E) re- presenting a collection V of web pages connected via links E. All web pages can be reached from a designated source page, represented by a source node s of G. Each web page carries a weight representative of the frequency with which it is visited. By adding hotlinks, at most one per page, we are interested in minimizing the expected number of steps needed to visit a selected set of web pages from the source page. For arbitrary DAGs we show that the problem is NP-complete. We also give algorithms for assigning hotlinks, as well as upper and lower bounds on the expected number of steps to reach the leaves from the source page s located at the root of a complete binary tree. Depending on the probability distribution (arbitrary, uniform, Zipf) the expected number of steps is at most c n, where c is a constant less than 1. For the geometric distribution we show how to obtain a constant average number of steps.

Original languageEnglish (US)
Title of host publicationAlgorithms and Computation - 11th International Conference, ISAAC 2000, Proceedings
EditorsD.T. Lee, Shang-Hua Teng, Shang-Hua Teng
PublisherSpringer Verlag
Number of pages12
ISBN (Print)3540412557, 9783540412557
StatePublished - 2000
Externally publishedYes
Event11th Annual International Symposium on Algorithms and Computation, ISAAC 2000 - Taipei, Taiwan, Province of China
Duration: Dec 18 2000Dec 20 2000

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Conference11th Annual International Symposium on Algorithms and Computation, ISAAC 2000
Country/TerritoryTaiwan, Province of China

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Computer Science(all)


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