Contracting Edges to Destroy a Pattern: A Complexity Study - Archive ouverte HAL
Chapitre D'ouvrage Année : 2023

Contracting Edges to Destroy a Pattern: A Complexity Study

Résumé

Given a graph G and an integer k, the objective of the Π -Contraction problem is to check whether there exists at most k edges in G such that contracting them in G results in a graph satisfying the property Π. We investigate the problem where Π is ‘H-free’ (without any induced copies of H). It is trivial that H -free Contraction is polynomial-time solvable if H is a complete graph of at most two vertices. We prove that, in all other cases, the problem is NP-complete. We then investigate the fixed-parameter tractability of these problems. We prove that whenever H is a tree, except for seven trees, H -free Contraction is W[2]-hard. This result along with the known results leaves behind only three unknown cases among trees.
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hal-04230180 , version 1 (26-10-2023)

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Dipayan Chakraborty, R. Sandeep. Contracting Edges to Destroy a Pattern: A Complexity Study. International Symposium on Fundamentals of Computation Theory. FCT 2023. Lecture Notes in Computer Science, 14292, Springer Nature Switzerland, pp.118-131, 2023, Lecture Notes in Computer Science, 978-3-031-43586-7. ⟨10.1007/978-3-031-43587-4_9⟩. ⟨hal-04230180⟩
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