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arXiv · 2507.03766

A Simple Algorithm for Combinatorial n-Fold ILPs Using the Steinitz Lemma

Sushmita Gupta·Pallavi Jain·Sanjay Seetharaman·Meirav Zehavi
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Abstract

We present an algorithm for a class of $n$-fold ILPs whose existing algorithms in literature are often either (1) based on the \textit{augmentation framework} where one starts with an arbitrary solution and then iteratively moves towards an optimal solution by solving appropriate programs; or (2) require solving a linear relaxation of the program; or (3) are based on decomposition/proximity based arguments. Combinatorial $n$-fold ILPs is a class of $n$-fold ILPs introduced and studied by Knop et al. [MP2020] that captures several other problems in a variety of domains. We present a simple and direct algorithm that solves combinatorial $n$-fold ILPs with unbounded non-negative variables via an application of the Steinitz lemma. Depending on the structure of the input ILP, we also improve upon the existing algorithms in the literature in terms of the running time, thereby showing an improvement that mirrors the one shown by Rohwedder [ICALP2025] contemporaneously and independently.

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Sushmita Gupta, Pallavi Jain, Sanjay Seetharaman, Meirav Zehavi. 2025-07-04. A Simple Algorithm for Combinatorial n-Fold ILPs Using the Steinitz Lemma. https://arxiv.org/abs/2507.03766

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