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arXiv · 2609.29259

Parameterized Complexity of Spanner Problems with Independent Weights and Lengths

Marius Bächler·Markus Chimani·Henning Jasper
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Abstract

In this paper, the parameterized complexity of the multiplicative $α$-spanner problem with independent weights and lengths on undirected graphs is considered for the first time. All prior FPT results (except one on DAGs) assume basic instances (i.e., with unit weights and lengths) and are parameterized in the stretch factor $α$ and the (in practice typically non-constant) number of removed edges. We show that several parameterizations do not allow FPT algorithms. However, our exclusion approach generalizes an existing algorithm for basic instances to arbitrary weights and lengths. It is parameterized by the total removed weight and a new tightness parameter. The latter is more precise than $α$ and allows us to also improve the best known result for basic instances. Our second algorithm, called inclusion approach, uses the natural parameterization in the spanner's total weight. We prove that this sole parameter leaves a W[2]-hard problem, but also show FPT algorithms exist when augmented with secondary parameters.

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Marius Bächler, Markus Chimani, Henning Jasper. 2026-09-24. Parameterized Complexity of Spanner Problems with Independent Weights and Lengths. https://arxiv.org/abs/2609.29259

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