English

On the complexity of finding a spanning even tree in a graph

Data Structures and Algorithms 2024-12-24 v1 Discrete Mathematics Combinatorics

Abstract

A tree is said to be even if for every pair of distinct leaves, the length of the unique path between them is even. In this paper we discuss the problem of determining whether an input graph has a spanning even tree. Hofmann and Walsh [Australas. J Comb. 35, 2006] proved that this problem can be solved in polynomial time on bipartite graphs. In contrast to this, we show that this problem is NP-complete even on planar graphs. We also give polynomial-time algorithms for several restricted classes of graphs, such as split graphs, cographs, cobipartite graphs, unit interval graphs, and block graphs.

Keywords

Cite

@article{arxiv.2412.17307,
  title  = {On the complexity of finding a spanning even tree in a graph},
  author = {Tesshu Hanaka and Yasuaki Kobayashi and Kazuhiro Kurita and Yasuko Matsui and Atsuki Nagao and Hirotaka Ono and Kazuhisa Seto},
  journal= {arXiv preprint arXiv:2412.17307},
  year   = {2024}
}

Comments

12 pages

R2 v1 2026-06-28T20:46:03.598Z