Abstract
In this paper, we introduce the problem of finding an orientation of a given undirected graph that maximizes the burning number of the resulting directed graph. We show that the problem is polynomial-time solvable on Kőnig–Egerváry graphs (and thus on bipartite graphs) and that an almost optimal solution can be computed in polynomial time for perfect graphs. On the other hand, we show that the problem is NP-hard in general and W[1]-hard parameterized by the target burning number. The hardness results are complemented by several fixed-parameter tractable results parameterized by structural parameters. Our main result in this direction shows that the problem is fixed-parameter tractable parameterized by cluster vertex deletion number plus clique number (and thus also by vertex cover number).
Partially supported by JSPS KAKENHI Grant Numbers JP18H04091, JP20H05793, JP21K11752, JP22H00513, JP23KJ1066. The full version of this paper is available at https://arxiv.org/abs/2311.13132.
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Notes
- 1.
In a directed graph, a vertex dominates itself and its out-neighbors.
- 2.
There is another way for handling orientation by using a variant of MSO\(_{2}\) defined for directed graphs, where we can fix an arbitrary orientation first (without using a k-coloring) and then represent reversed edges by an edge set. See e.g., [18].
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Courtiel, J., Dorbec, P., Gima, T., Lecoq, R., Otachi, Y. (2024). Orientable Burning Number of Graphs. In: Uehara, R., Yamanaka, K., Yen, HC. (eds) WALCOM: Algorithms and Computation. WALCOM 2024. Lecture Notes in Computer Science, vol 14549. Springer, Singapore. https://doi.org/10.1007/978-981-97-0566-5_27
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