, Volume 18, Issue 1, pp 99–110 | Cite as

A series of approximation algorithms for the acyclic directed steiner tree problem

  • A. Zelikovsky


Given an acyclic directed network, a subsetS of nodes (terminals), and a rootr, theacyclic directed Steiner tree problem requires a minimum-cost subnetwork which contains paths fromr to each terminal. It is known that unlessNPDTIME[n polylogn ] no polynomial-time algorithm can guarantee better than (lnk)/4-approximation, wherek is the number of terminals. In this paper we give anO(k ε)-approximation algorithm for any ε>0. This result improves the previously knownk-approximation.

Key Words

Algorithms Approximations Steiner tree 


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Copyright information

© Springer-Verlag New York Inc. 1997

Authors and Affiliations

  • A. Zelikovsky
    • 1
  1. 1.Computer Science Department, Thornton HallUniversity of VirginiaCharlottesvilleUSA

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