Dublois, Louis and Lampis, Michael and Paschos, Vangelis Th. - New Algorithms for Mixed Dominating Set

dmtcs:6824 - Discrete Mathematics & Theoretical Computer Science, April 30, 2021, vol. 23 no. 1
New Algorithms for Mixed Dominating Set

Authors: Dublois, Louis and Lampis, Michael and Paschos, Vangelis Th.

A mixed dominating set is a collection of vertices and edges that dominates all vertices and edges of a graph. We study the complexity of exact and parameterized algorithms for \textsc{Mixed Dominating Set}, resolving some open questions. In particular, we settle the problem's complexity parameterized by treewidth and pathwidth by giving an algorithm running in time $O^*(5^{tw})$ (improving the current best $O^*(6^{tw})$), as well as a lower bound showing that our algorithm cannot be improved under the Strong Exponential Time Hypothesis (SETH), even if parameterized by pathwidth (improving a lower bound of $O^*((2 - \varepsilon)^{pw})$). Furthermore, by using a simple but so far overlooked observation on the structure of minimal solutions, we obtain branching algorithms which improve both the best known FPT algorithm for this problem, from $O^*(4.172^k)$ to $O^*(3.510^k)$, and the best known exponential-time exact algorithm, from $O^*(2^n)$ and exponential space, to $O^*(1.912^n)$ and polynomial space.

Volume: vol. 23 no. 1
Section: Discrete Algorithms
Published on: April 30, 2021
Submitted on: October 5, 2020
Keywords: Computer Science - Data Structures and Algorithms,Computer Science - Computational Complexity


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