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• W3138202270 abstract "We study the parameterized complexity of various classic vertex deletion problems such as Odd cycle transversal, Vertex planarization, and Chordal vertex deletion under hybrid parameterizations. Existing FPT algorithms for these problems either focus on the parameterization by solution size, detecting solutions of size $k$ in time $f(k) cdot n^{O(1)}$, or width parameterizations, finding arbitrarily large optimal solutions in time $f(w) cdot n^{O(1)}$ for some width measure $w$ like treewidth. We unify these lines of research by presenting FPT algorithms for parameterizations that can simultaneously be arbitrarily much smaller than the solution size and the treewidth. We consider two classes of parameterizations which are relaxations of either treedepth of treewidth. They are related to graph decompositions in which subgraphs that belong to a target class H (e.g., bipartite or planar) are considered simple. First, we present a framework for computing approximately optimal decompositions for miscellaneous classes H. Namely, if the cost of an optimal decomposition is $k$, we show how to find a decomposition of cost $k^{O(1)}$ in time $f(k) cdot n^{O(1)}$. Secondly, we exploit the constructed decompositions for solving vertex-deletion problems by extending ideas from algorithms using iterative compression and the finite state property. For the three mentioned vertex-deletion problems, and all problems which can be formulated as hitting a finite set of connected forbidden (a) minors or (b) (induced) subgraphs, we obtain FPT algorithms with respect to both studied parameterizations." @default.
• W3138202270 created "2021-03-29" @default.
• W3138202270 creator A5016857499 @default.
• W3138202270 creator A5048942396 @default.
• W3138202270 creator A5068809914 @default.
• W3138202270 date "2021-03-17" @default.
• W3138202270 modified "2023-10-18" @default.
• W3138202270 title "Vertex Deletion Parameterized by Elimination Distance and Even Less" @default.
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• W3138202270 hasPublicationYear "2021" @default.
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