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IPL
2006
95views more  IPL 2006»
15 years 1 months ago
Smaller superconcentrators of density 28
An N-superconcentrator is a directed, acyclic graph with N input nodes and N output nodes such that every subset of the inputs and every subset of the outputs of same cardinality ...
Uwe Schöning
IPL
2006
116views more  IPL 2006»
15 years 1 months ago
Guarding galleries and terrains
Let P be a polygon with n vertices. We say that two points of P see each other if the line segment connecting them lies inside (the closure of) P. In this paper we present efficie...
Alon Efrat, Sariel Har-Peled
IPL
2006
108views more  IPL 2006»
15 years 1 months ago
Robustness of k-gon Voronoi diagram construction
In this paper, we present a plane sweep algorithm for constructing the Voronoi diagram of a set of non-crossing line segments in 2D space using a distance metric induced by a regu...
Zhenming Chen, Evanthia Papadopoulou, Jinhui Xu
IPL
2006
89views more  IPL 2006»
15 years 1 months ago
Optimal 2-constraint satisfaction via sum-product algorithms
We show that for a given set of m pairwise constraints over n variables, a variable assignment that satisfies maximally many m constraints (MAX-2-CSP) can be found in O(nm dn/3) t...
Mikko Koivisto
IPL
2006
88views more  IPL 2006»
15 years 1 months ago
On Quickselect, partial sorting and Multiple Quickselect
We present explicit solutions of a class of recurrences related to the Quickselect algorithm. Thus we are immediately able to solve recurrences arising at the partial sorting probl...
Markus Kuba