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» The Polymatroid Steiner Problems
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SODA
2008
ACM
73views Algorithms» more  SODA 2008»
14 years 9 days ago
Set connectivity problems in undirected graphs and the directed Steiner network problem
Chandra Chekuri, Guy Even, Anupam Gupta, Danny Seg...
STOC
2010
ACM
261views Algorithms» more  STOC 2010»
14 years 3 months ago
An Improved LP-based Approximation for Steiner Tree
The Steiner tree problem is one of the most fundamental ÆÈ-hard problems: given a weighted undirected graph and a subset of terminal nodes, find a minimum weight tree spanning ...
Jaroslaw Byrka, Fabrizio Grandoni, Thomas Rothvoss...
SODA
2008
ACM
71views Algorithms» more  SODA 2008»
14 years 9 days ago
Two-phase greedy algorithms for some classes of combinatorial linear programs
We present greedy algorithms for some classes of combinatorial packing and cover problems within the general formal framework of Hoffman and Schwartz' lattice polyhedra. Our ...
Ulrich Faigle, Britta Peis
STOC
2009
ACM
120views Algorithms» more  STOC 2009»
14 years 11 months ago
A constant-factor approximation for stochastic Steiner forest
We consider the stochastic Steiner forest problem: suppose we were given a collection of Steiner forest instances, and were guaranteed that a random one of these instances would a...
Anupam Gupta, Amit Kumar
JUCS
2008
172views more  JUCS 2008»
13 years 11 months ago
A Hybrid Transgenetic Algorithm for the Prize Collecting Steiner Tree Problem
: Evolutionary algorithms are effective search tools for tackling difficult optimization problems. In this paper an algorithm based on living processes where cooperation is the mai...
Elizabeth Ferreira Gouvea Goldbarg, Marco Cé...