Continuous bottleneck tree partitioning problems

  • Authors:

  • Nir Halman;Arie Tamir

  • Affiliations:

  • Department of Statistics and Operations Research, School of Mathematical Sciences, Tel-Aviv University, Tel-Aviv 69978, Israel;Department of Statistics and Operations Research, School of Mathematical Sciences, Tel-Aviv University, Tel-Aviv 69978, Israel

  • Venue:
  • Discrete Applied Mathematics
  • Year:
  • 2004

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Abstract

We study continuous partitioning problems on tree network spaces whose edges and nodes are points in Euclidean spaces. A continuous partition of this space into p connected components is a collection of p subtrees, such that no pair of them intersect at more than one point, and their union is the tree space. An edge-partition is a continuous partition defined by selecting p-1 cut points along the edges of the underlying tree, which is assumed to have n nodes. These cut points induce a partition into p subtrees (connected components). The objective is to minimize (maximize) the maximum (minimum) "size" of the components (the min-max (max-min) problem). When the size is the length of a subtree, the min-max and the max-min partitioning problems are NP-hard. We present O(n2 log(min(p,n))) algorithms for the edge-partitioning versions of the problem. When the size is the diameter, the min-max problems coincide with the continuous p-center problem. We describe O(n log3 n) and O(n log2 n) algorithms for the max-min partitioning and edge-partitioning problems, respectively, where the size is the diameter of a component.