Polylogarithmic-time deterministic network decomposition and distributed derandomization

V Rozhoň, M Ghaffari - Proceedings of the 52nd Annual ACM SIGACT …, 2020 - dl.acm.org
We present a simple polylogarithmic-time deterministic distributed algorithm for network
decomposition. This improves on a celebrated 2 O (√ log n)-time algorithm of Panconesi …

An exponential separation between randomized and deterministic complexity in the LOCAL model

YJ Chang, T Kopelowitz, S Pettie - SIAM Journal on Computing, 2019 - SIAM
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 …

Sublinear algorithms for (Δ+ 1) vertex coloring

S Assadi, Y Chen, S Khanna - Proceedings of the Thirtieth Annual ACM-SIAM …, 2019 - SIAM
Any graph with maximum degree Δ admits a proper vertex coloring with Δ+ 1 colors that can
be found via a simple sequential greedy algorithm in linear time and space. But can one find …

On derandomizing local distributed algorithms

M Ghaffari, DG Harris, F Kuhn - 2018 IEEE 59th Annual …, 2018 - ieeexplore.ieee.org
The gap between the known randomized and deterministic local distributed algorithms
underlies arguably the most fundamental and central open question in distributed graph …

The complexity of (Δ+ 1) coloring in congested clique, massively parallel computation, and centralized local computation

YJ Chang, M Fischer, M Ghaffari, J Uitto… - Proceedings of the 2019 …, 2019 - dl.acm.org
In this paper, we present new randomized algorithms that improve the complexity of the
classic (Δ+ 1)-coloring problem, and its generalization (Δ+ 1)-list-coloring, in three well …

Deterministic distributed vertex coloring: Simpler, faster, and without network decomposition

M Ghaffari, F Kuhn - 2021 IEEE 62nd Annual Symposium on …, 2022 - ieeexplore.ieee.org
We present a simple deterministic distributed algorithm that computes a (Δ+1)-vertex
coloring in O(log^2Δ.log\n) rounds. The algorithm can be implemented with O(log\n)-bit …

Faster deterministic distributed MIS and approximate matching

M Ghaffari, C Grunau - Proceedings of the 55th Annual ACM Symposium …, 2023 - dl.acm.org
We present an Õ (log2 n) round deterministic distributed algorithm for the maximal
independent set problem. By known reductions, this round complexity extends also to …

Brooks' theorem in graph streams: a single-pass semi-streaming algorithm for∆-coloring

S Assadi, P Kumar, P Mittal - Proceedings of the 54th Annual ACM …, 2022 - dl.acm.org
Every graph with maximum degree Δ can be colored with (Δ+ 1) colors using a simple
greedy algorithm. Remarkably, recent work has shown that one can find such a coloring …

Distributed maximal independent set using small messages

M Ghaffari - Proceedings of the Thirtieth Annual ACM-SIAM …, 2019 - SIAM
Abstract Maximal Independent Set (MIS) is one of the central problems in distributed graph
algorithms. The celebrated works of Luby [STOC'85] and Alon, Babai, and Itai [JALG'86] …

Local conflict coloring revisited: Linial for lists

Y Maus, T Tonoyan - arxiv preprint arxiv:2007.15251, 2020 - arxiv.org
Linial's famous color reduction algorithm reduces a given $ m $-coloring of a graph with
maximum degree $\Delta $ to a $ O (\Delta^ 2\log m) $-coloring, in a single round in the …