Tree t-spanners in Outerplanar Graphs via Supply Demand Partition
Abstract
A tree t-spanner of an unweighted graph G is a spanning tree T such that for every two vertices their distance in T is at most t times their distance in G. Given an unweighted graph G and a positive integer t as input, the tree t-spanner problem is to compute a tree t-spanner of G if one exists. This decision problem is known to be NP-complete even in the restricted class of unweighted planar graphs. We present a linear-time reduction from tree t-spanner in outerplanar graphs to the supply-demand tree partition problem. Based on this reduction, we obtain a linear-time algorithm to solve tree t-spanner in outerplanar graphs. Consequently, we show that the minimum value of t for which an input outerplanar graph on n vertices has a tree t-spanner can be found in O(n log n) time.
Cite
@article{arxiv.1210.7919,
title = {Tree t-spanners in Outerplanar Graphs via Supply Demand Partition},
author = {N. S. Narayanaswamy and G. Ramakrishna},
journal= {arXiv preprint arXiv:1210.7919},
year = {2013}
}