1002 search results - page 20 / 201 » Towards Graph Programs for Graph Algorithms |
183
click to vote
STOC
2010
ACM
15 years 10 months ago
2010
ACM
We give the first polynomial-time approximation scheme (PTAS) for the Steiner forest problem on planar graphs and, more generally, on graphs of bounded genus. As a first step, w...
132
click to vote
SWAT
2004
Springer
15 years 11 months ago
2004
Springer
In this paper we introduce a new notion of collective tree spanners. We say that a graph G = (V, E) admits a system of µ collective additive tree r-spanners if there is a system T...
173
click to vote
ICALP
2009
Springer
16 years 6 months ago
2009
Springer
We improve the approximation ratios for two optimization problems in planar graphs. For node-weighted Steiner tree, a classical network-optimization problem, the best achievable ap...
158
click to vote
CORR
2008
Springer
15 years 6 months ago
2008
Springer
In this paper we present an algorithmic framework for solving a class of combinatorial optimization problems on graphs with bounded pathwidth. The problems are NP-hard in general, ...
171
click to vote
ASP
2003
Springer
15 years 11 months ago
2003
Springer
We investigate rule dependency graphs and their colorings for characterizing the computation of answer sets of logic programs. To this end, we develop a series of operational chara...