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Grid Recognition: Classical and Parameterized Computational Perspectives

Authors Siddharth Gupta, Guy Sa'ar, Meirav Zehavi

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Siddharth Gupta
  • Ben Gurion University of the Negev, Beer Sheva, Israel
Guy Sa'ar
  • Ben Gurion University of the Negev, Beer Sheva, Israel
Meirav Zehavi
  • Ben Gurion University of the Negev, Beer Sheva, Israel

Funding

Supported in part by the United States - Israel Binational Science Foundation (BSF) grant no. 2018302 and Israel Science Foundation (ISF) individual research grant no. 1176/18.
  • Gupta, Siddharth: Supported in part by the Zuckerman STEM Leadership Program.
  • Sa'ar, Guy: Supported in part by the Israeli Smart Transportation Research Center (ISTRC).

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Siddharth Gupta, Guy Sa'ar, and Meirav Zehavi. Grid Recognition: Classical and Parameterized Computational Perspectives. In 32nd International Symposium on Algorithms and Computation (ISAAC 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 212, pp. 37:1-37:15, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021) https://doi.org/10.4230/LIPIcs.ISAAC.2021.37

Abstract

Grid graphs, and, more generally, k×r grid graphs, form one of the most basic classes of geometric graphs. Over the past few decades, a large body of works studied the (in)tractability of various computational problems on grid graphs, which often yield substantially faster algorithms than general graphs. Unfortunately, the recognition of a grid graph (given a graph G, decide whether it can be embedded into a grid graph) is particularly hard - it was shown to be NP-hard even on trees of pathwidth 3 already in 1987. Yet, in this paper, we provide several positive results in this regard in the framework of parameterized complexity (additionally, we present new and complementary hardness results). Specifically, our contribution is threefold. First, we show that the problem is fixed-parameter tractable (FPT) parameterized by k+mcc where mcc is the maximum size of a connected component of G. This also implies that the problem is FPT parameterized by td+k where td is the treedepth of G, as td ≤ mcc (to be compared with the hardness for pathwidth 2 where k = 3). (We note that when k and r are unrestricted, the problem is trivially FPT parameterized by td.) Further, we derive as a corollary that strip packing is FPT with respect to the height of the strip plus the maximum of the dimensions of the packed rectangles, which was previously only known to be in XP. Second, we present a new parameterization, denoted a_G, relating graph distance to geometric distance, which may be of independent interest. We show that the problem is para-NP-hard parameterized by a_G, but FPT parameterized by a_G on trees, as well as FPT parameterized by k+a_G. Third, we show that the recognition of k× r grid graphs is NP-hard on graphs of pathwidth 2 where k = 3. Moreover, when k and r are unrestricted, we show that the problem is NP-hard on trees of pathwidth 2, but trivially solvable in polynomial time on graphs of pathwidth 1.

Subject Classification

ACM Subject Classification
  • Theory of computation → Fixed parameter tractability
  • Mathematics of computing → Graph algorithms
Keywords
  • Grid Recognition
  • Grid Graph
  • Parameterized Complexity

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