On-line generalized steiner problem

Baruch Awerbuch, Yossi Azar, Yair Bartal

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

30 Scopus citations


The Generalized Steiner Problem (GSP) is defined as follows. We are given a graph with non-negative weights and a set of pairs of vertices. The algorithm has to construct minimum weight subgraph such that the two nodes of each pair are connected by a path. We consider the on-line generalized Steiner problem, in which pairs of vertices arrive on-line and are needed to be connected immediately. We give a simple O(log n) competitive deterministic on-line algorithm. The previous best online algorithm (by Westbrook and Yan) was O(√n log n) competitive. We also consider the network connectivity leasing problem which is a generalization of the GSP. Here edges of the graph can be either bought or leased for different costs. We provide simple randomized O(log2 n) competitive algorithm based on the on-line generalized Steiner problem result.

Original languageAmerican English
Title of host publicationProceedings of the 7th Annual ACM-SIAM Symposium on Discrete Algorithms, SODA 1996
PublisherAssociation for Computing Machinery
Number of pages7
ISBN (Electronic)0898713668
StatePublished - 28 Jan 1996
Externally publishedYes
Event7th Annual ACM-SIAM Symposium on Discrete Algorithms, SODA 1996 - Atlanta, United States
Duration: 28 Jan 199630 Jan 1996

Publication series

NameProceedings of the Annual ACM-SIAM Symposium on Discrete Algorithms
VolumePart F129447


Conference7th Annual ACM-SIAM Symposium on Discrete Algorithms, SODA 1996
Country/TerritoryUnited States

Bibliographical note

Funding Information:
‘Johns Hopkins University and Lab. for Computer ence, MIT. Supported by NSF contract 9114440-CCR, ARPA/Army contract DABT63-93-C-0038, ARPA/Air Force Contract F19628-95-C-0137, and NIST/USRA Contract 5555. 47. E-Mail: baruch@cs.jhu.edu. ‘Department of Computer Science, Tel University ,Tel-Aviv 69978, Israel. Research supported part by Allon Fellowship and by the Israel Science Foundation admimistered by the Israel Academy of Sciences. E-Mail: azarQmath.tau.ac.il. *Department of Computer Science, Tel-Aviv University, Tel-Aviv 69978, Israel. Research supported in part by Ben Gu-rion Fellowship, the Ministry of Science and Arts. E-Mail: yairb@math.tau.ac.il.


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