554 search results - page 9 / 111 » Approximation algorithms and hardness results for labeled co... |
FOCS
2002
IEEE
14 years 15 days ago
2002
IEEE
We consider the classical vertex cover and set cover problems with the addition of hard capacity constraints. This means that a set (vertex) can only cover a limited number of its...
STOC
2007
ACM
14 years 7 months ago
2007
ACM
Given as input a directed graph on N vertices and a set of source-destination pairs, we study the problem of routing the maximum possible number of source-destination pairs on pat...
SODA
1997
ACM
13 years 8 months ago
1997
ACM
Map labeling is of fundamental importance in cartography and geographical information systems and is one of the areas targeted for research by the ACM Computational Geometry Impac...
JCO
2010
13 years 6 months ago
2010
Abstract Polynomial-time data reduction is a classical approach to hard graph problems. Typically, particular small subgraphs are replaced by smaller gadgets. We generalize this ap...
ESA
2003
Springer
14 years 23 days ago
2003
Springer
We prove that various geometric covering problems, related to the Travelling Salesman Problem cannot be efficiently approximated to within any constant factor unless P = NP. This ...