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• W3088630545 abstract "In the textsc{Maximum Degree Contraction} problem, input is a graph $G$ on $n$ vertices, and integers $k, d$, and the objective is to check whether $G$ can be transformed into a graph of maximum degree at most $d$, using at most $k$ edge contractions. A simple brute-force algorithm that checks all possible sets of edges for a solution runs in time $n^{mathcal{O}(k)}$. As our first result, we prove that this algorithm is asymptotically optimal, upto constants in the exponents, under Exponential Time Hypothesis (Ð). Belmonte, Golovach, van't Hof, and Paulusma studied the problem in the realm of Parameterized Complexity and proved, among other things, that it admits an FPT algorithm running in time $(d + k)^{2k} cdot n^{mathcal{O}(1)} = 2^{mathcal{O}(k log (k+d) )} cdot n^{mathcal{O}(1)}$, and remains NP-hard for every constant $d ge 2$ (Acta Informatica $(2014)$). We present a different FPT algorithm that runs in time $2^{mathcal{O}(dk)} cdot n^{mathcal{O}(1)}$. In particular, our algorithm runs in time $2^{mathcal{O}(k)} cdot n^{mathcal{O}(1)}$, for every fixed $d$. In the same article, the authors asked whether the problem admits a polynomial kernel, when parameterized by $k + d$. We answer this question in the negative and prove that it does not admit a polynomial compression unless $NP subseteq coNP/poly$." @default.
• W3088630545 created "2020-10-01" @default.
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• W3088630545 date "2020-09-24" @default.
• W3088630545 modified "2023-09-23" @default.
• W3088630545 title "On the Parameterized Complexity of textsc{Maximum Degree Contraction} Problem." @default.
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• W3088630545 hasPublicationYear "2020" @default.
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