research-article

Fast Hamiltonicity Checking Via Bases of Perfect Matchings

Authors:

Stefan Kratsch,

Jesper NederlofAuthors Info & Claims

Journal of the ACM (JACM), Volume 65, Issue 3

Article No.: 12, Pages 1 - 46

https://doi.org/10.1145/3148227

Published: 13 March 2018 Publication History

Abstract

For an even integer t ≥ 2, the Matching Connectivity matrix H_t is a matrix that has rows and columns both labeled by all perfect matchings of the complete graph on t vertices; an entry H_t[M₁, M₂] is 1 if M₁ and M₂ form a Hamiltonian cycle and 0 otherwise. Motivated by applications for the Hamiltonicity problem, we show that H_t has rank exactly 2^t/2−1 over GF(2). The upper bound is established by an explicit factorization of H_t as the product of two submatrices; the matchings labeling columns and rows, respectively, of the submatrices therefore form a basis X_t of H_t. The lower bound follows because the 2^t/2−1 × 2^t/2−1 submatrix with rows and columns labeled by X_t can be seen to have full rank.

We obtain several algorithmic results based on the rank of H_t and the particular structure of the matchings in X_t. First, we present a 1.888ⁿ n^O(1) time Monte Carlo algorithm that solves the Hamiltonicity problem in directed bipartite graphs. Second, we give a Monte Carlo algorithm that solves the problem in (2 + √ 2)^pwn^O(1) time when provided with a path decomposition of width pw for the input graph. Moreover, we show that this algorithm is best possible under the Strong Exponential Time Hypothesis, in the sense that an algorithm with running time (2 + √2 − ϵ)^pwn^O(1), for any ϵ > 0, would imply the breakthrough result of a (2 − ϵ^′)ⁿ-time algorithm for CNF-Sat for some ϵ^′ > 0.

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Index Terms

Fast Hamiltonicity Checking Via Bases of Perfect Matchings
1. Mathematics of computing
  1. Discrete mathematics
    1. Graph theory
      1. Matchings and factors
2. Theory of computation
  1. Design and analysis of algorithms
    1. Graph algorithms analysis
    2. Parameterized complexity and exact algorithms

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cover image Journal of the ACM

Journal of the ACM Volume 65, Issue 3

June 2018

285 pages

ISSN:0004-5411

EISSN:1557-735X

DOI:10.1145/3191817

Editor:
Éva Tardos
Cornell University

Issue’s Table of Contents

Copyright © 2018 ACM.

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Association for Computing Machinery

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Publication History

Published: 13 March 2018

Accepted: 01 October 2017

Revised: 01 September 2016

Received: 01 June 2015

Published in JACM Volume 65, Issue 3

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Polish National Science Centre
European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program
NWO grant “Space and Time Efficient Structural Improvements of Dynamic Programming Algorithms.”

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Björklund AKaski PMohar BShinkar IO'Donnell R(2024)The Asymptotic Rank Conjecture and the Set Cover Conjecture Are Not Both TrueProceedings of the 56th Annual ACM Symposium on Theory of Computing10.1145/3618260.3649656(859-870)Online publication date: 10-Jun-2024
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Alkema Hde Berg Mvan der Hofstad RKisfaludi-Bak S(2024)Euclidean TSP in Narrow StripsDiscrete & Computational Geometry10.1007/s00454-023-00609-771:4(1456-1506)Online publication date: 1-Jun-2024
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Deligkas AMertzios GSpirakis PZamaraev V(2024)Approximate and Randomized Algorithms for Computing a Second Hamiltonian CycleAlgorithmica10.1007/s00453-024-01238-z86:9(2766-2785)Online publication date: 1-Sep-2024
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