
Let $G=(V,E)$ be a graph. An ordering of $G$ is a bijection $��: V\dom \{1,2,..., |V|\}.$ For a vertex $v$ in $G$, its closed neighborhood is $N[v]=\{u\in V: uv\in E\}\cup \{v\}.$ The profile of an ordering $��$ of $G$ is $\prf_��(G)=\sum_{v\in V}(��(v)-\min\{��(u): u\in N[v]\}).$ The profile $\prf(G)$ of $G$ is the minimum of $\prf_��(G)$ over all orderings $��$ of $G$. It is well-known that $\prf(G)$ is the minimum number of edges in an interval graph $H$ that contains $G$ is a subgraph. Since $|V|-1$ is a tight lower bound for the profile of connected graphs $G=(V,E)$, the parametrization above the guaranteed value $|V|-1$ is of particular interest. We show that deciding whether the profile of a connected graph $G=(V,E)$ is at most $|V|-1+k$ is fixed-parameter tractable with respect to the parameter $k$. We achieve this result by reduction to a problem kernel of linear size.
FOS: Computer and information sciences, Discrete Mathematics (cs.DM), Analysis of algorithms and problem complexity, above guaranteed value, graph profile, fixed parameter tractability, kernel, Graph theory (including graph drawing) in computer science, Computer Science - Data Structures and Algorithms, Data Structures and Algorithms (cs.DS), Computer Science - Discrete Mathematics
FOS: Computer and information sciences, Discrete Mathematics (cs.DM), Analysis of algorithms and problem complexity, above guaranteed value, graph profile, fixed parameter tractability, kernel, Graph theory (including graph drawing) in computer science, Computer Science - Data Structures and Algorithms, Data Structures and Algorithms (cs.DS), Computer Science - Discrete Mathematics
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