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Locally Checkable Labeling (LCL) problems include essentially all the classic problems of $\mathsf{LOCAL}$ distributed algorithms. In a recent enlightening revelation, Chang and Pettie [arXiv 1704.06297] showed that any LCL (on bounded…

数据结构与算法 · 计算机科学 2017-05-17 Manuela Fischer , Mohsen Ghaffari

In this work, we study the Lov\'asz local lemma (LLL) problem in the area of distributed quantum computing, which has been the focus of attention of recent advances in quantum computing [STOC'24, STOC'25, STOC'25]. We prove a lower bound of…

分布式、并行与集群计算 · 计算机科学 2025-10-20 Sebastian Brandt , Tim Göttlicher

We consider the task of designing Local Computation Algorithms (LCA) for applications of the Lov\'{a}sz Local Lemma (LLL). LCA is a class of sublinear algorithms proposed by Rubinfeld et al.~\cite{Ronitt} that have received a lot of…

数据结构与算法 · 计算机科学 2020-07-08 Dimitris Achlioptas , Themis Gouleakis , Fotis Iliopoulos

We present a randomized Local Computation Algorithm (LCA) with query complexity $poly(\Delta) \cdot \log n$ for the Maximal Independent Set (MIS) problem. That is, the algorithm determines whether each node is in the computed MIS or not…

数据结构与算法 · 计算机科学 2022-10-04 Mohsen Ghaffari

In the model of \emph{local computation algorithms} (LCAs), we aim to compute the queried part of the output by examining only a small (sublinear) portion of the input. Many recently developed LCAs on graph problems achieve time and space…

数据结构与算法 · 计算机科学 2015-02-16 Reut Levi , Ronitt Rubinfeld , Anak Yodpinyanee

The Local Computation Algorithms (LCA) model is a computational model aimed at problem instances with huge inputs and output. For graph problems, the input graph is accessed using probes: strong probes (SP) specify a vertex $v$ and receive…

数据结构与算法 · 计算机科学 2017-03-23 Uriel Feige , Boaz Patt-Shamir , Shai Vardi

The Lov\'asz Local Lemma is a versatile result in probability theory, characterizing circumstances in which a collection of $n$ `bad events', each occurring with probability at most $p$ and dependent on a set of underlying random variables,…

数据结构与算法 · 计算机科学 2025-02-18 Peter Davies-Peck

Recently, Brandt, Maus and Uitto [PODC'19] showed that, in a restricted setting, the dependency of the complexity of the distributed Lov\'asz Local Lemma (LLL) on the chosen LLL criterion exhibits a sharp threshold phenomenon: They proved…

数据结构与算法 · 计算机科学 2020-06-09 Sebastian Brandt , Christoph Grunau , Václav Rozhoň

We present a poly $\log \log n$ time randomized CONGEST algorithm for a natural class of Lovasz Local Lemma (LLL) instances on constant degree graphs. This implies, among other things, that there are no LCL problems with randomized…

分布式、并行与集群计算 · 计算机科学 2021-08-06 Yannic Maus , Jara Uitto

Over the past decade, a long line of research has investigated the distributed complexity landscape of locally checkable labeling (LCL) problems on bounded-degree graphs, culminating in an almost-complete classification on general graphs…

数据结构与算法 · 计算机科学 2024-02-16 Alkida Balliu , Sebastian Brandt , Fabian Kuhn , Dennis Olivetti , Gustav Schmid

We give practical, efficient algorithms that automatically determine the asymptotic distributed round complexity of a given locally checkable graph problem in the $[\Theta(\log n), \Theta(n)]$ region, in two settings. We present one…

分布式、并行与集群计算 · 计算机科学 2022-09-05 Alkida Balliu , Sebastian Brandt , Yi-Jun Chang , Dennis Olivetti , Jan Studený , Jukka Suomela

We show that any randomised Monte Carlo distributed algorithm for the Lov\'asz local lemma requires $\Omega(\log \log n)$ communication rounds, assuming that it finds a correct assignment with high probability. Our result holds even in the…

分布式、并行与集群计算 · 计算机科学 2015-11-04 Sebastian Brandt , Orr Fischer , Juho Hirvonen , Barbara Keller , Tuomo Lempiäinen , Joel Rybicki , Jukka Suomela , Jara Uitto

In this work, we focus on designing an efficient Local Computation Algorithm (LCA) for the set cover problem, which is a core optimization task. The state-of-the-art LCA for computing $O(\log \Delta)$-approximate set cover, developed by…

数据结构与算法 · 计算机科学 2026-03-26 Slobodan Mitrović , Srikkanth Ramachandran , Ronitt Rubinfeld , Mihir Singhal

Over the past 30 years numerous algorithms have been designed for symmetry breaking problems in the LOCAL model, such as maximal matching, MIS, vertex coloring, and edge-coloring. For most problems the best randomized algorithm is at least…

计算复杂性 · 计算机科学 2016-04-07 Yi-Jun Chang , Tsvi Kopelowitz , Seth Pettie

Locally checkable labeling problems (LCLs) are distributed graph problems in which a solution is globally feasible if it is locally feasible in all constant-radius neighborhoods. Vertex colorings, maximal independent sets, and maximal…

分布式、并行与集群计算 · 计算机科学 2020-02-19 Alkida Balliu , Sebastian Brandt , Dennis Olivetti , Jukka Suomela

Recent research revealed the existence of gaps in the complexity landscape of locally checkable labeling (LCL) problems in the LOCAL model of distributed computing. For example, the deterministic round complexity of any LCL problem on…

数据结构与算法 · 计算机科学 2020-09-22 Yi-Jun Chang

The Lov\'asz Local Lemma is a classic result in probability theory that is often used to prove the existence of combinatorial objects via the probabilistic method. In its simplest form, it states that if we have $n$ `bad events', each of…

分布式、并行与集群计算 · 计算机科学 2022-10-20 Peter Davies

We study the local complexity landscape of locally checkable labeling (LCL) problems on constant-degree graphs with a focus on complexities below $\log^* n$. Our contribution is threefold: Our main contribution is that we complete the…

数据结构与算法 · 计算机科学 2022-09-26 Christoph Grunau , Vaclav Rozhon , Sebastian Brandt

We investigate local computation algorithms (LCA) for two-coloring of $k$-uniform hypergraphs. We focus on hypergraph instances that satisfy strengthened assumption of the Lov\'{a}sz Local Lemma of the form $2^{1-\alpha k} (\Delta+1)…

数据结构与算法 · 计算机科学 2023-05-05 Andrzej Dorobisz , Jakub Kozik

The celebrated Time Hierarchy Theorem for Turing machines states, informally, that more problems can be solved given more time. The extent to which a time hierarchy-type theorem holds in the distributed LOCAL model has been open for many…

分布式、并行与集群计算 · 计算机科学 2017-04-24 Yi-Jun Chang , Seth Pettie
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