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arXiv · 2508.20041

Flow-weighted Layered Metric Euclidean Capacitated Steiner Tree Problem

Thomas Bläsius·Henrik Csöre·Max Göttlicher·Elly Schmidt·Wendy Yi
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Abstract

Motivated by hierarchical networks, we introduce the Flow-weighted Layered Metric Euclidean Capacitated Steiner Tree (FLaMECaST) problem, a variant of the Euclidean Steiner tree with layered structure and capacity constraints per layer. The goal is to construct a cost-optimal Steiner forest connecting a set of sources to a set of sinks under load-dependent edge costs. We prove that FLaMECaST is NP-hard to approximate, even in restricted cases where all sources lie on a circle. However, assuming few additional constraints for such instances, we design a dynamic program that achieves a $\left(1 + \frac{1}{2^n}\right)$-approximation in polynomial time. By generalizing the structural insights the dynamic program is based on, we extend the approach to certain settings, where all sources are positioned on a convex polygon.

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Thomas Bläsius, Henrik Csöre, Max Göttlicher, Elly Schmidt, Wendy Yi. 2025-08-27. Flow-weighted Layered Metric Euclidean Capacitated Steiner Tree Problem. https://arxiv.org/abs/2508.20041

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