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Eyob Woldeghebriel

dblp:329/5645 · DBLP profile ↗
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1ranked-venue papers
0as first author
1since 2021 · last 2022
—ORCID · none

Domains — the database's venue-derived domains; a paper can count in several

Theory of computation · 1 · 1 since 2021

Expertise — from the expertise taxonomy: the topics of the expert's papers under the CCF categories. A weight counts papers with recency: 1 for a paper about the topic, 0.3 when the topic is its context, halved every five years.

Theoretical computer science
1 paper
Graph algorithms and graph theory · 100%

Topics — the 4 heaviest of 4, each with the papers that count most for it

TopicWeightPapersLastEvidence papers
Graph algorithms and graph theory › shortest path
all-pairs shortest paths
0.612022
Algorithms and Lower Bounds for Replacement Paths under Multiple Edge Failure · FOCS 2022
Graph algorithms and graph theory › graph algorithms › fault-tolerant graph structures
fault-tolerant shortest paths
0.612022
Algorithms and Lower Bounds for Replacement Paths under Multiple Edge Failure · FOCS 2022
Graph algorithms and graph theory
graph algorithms
0.612022
Algorithms and Lower Bounds for Replacement Paths under Multiple Edge Failure · FOCS 2022
Graph algorithms and graph theory › graph algorithms › fault-tolerant graph structures › fault-tolerant shortest paths
replacement paths
0.612022
Algorithms and Lower Bounds for Replacement Paths under Multiple Edge Failure · FOCS 2022

Methods — techniques the papers use, named apart from their topics

fast matrix multiplication · 0.6conditional lower bounds · 0.6
YearPublicationVenuePosition
2022 Algorithms and Lower Bounds for Replacement Paths under Multiple Edge Failure
abstract
This paper considers a natural fault-tolerant shortest paths problem: for some constant integer f, given a directed weighted graph with no negative cycles and two fixed vertices s and t, compute (either explicitly or implicitly) for every tuple of f edges, the distance from s to t if these edges fail. We call this problem f-Fault Replacement Paths (f FRP).We first present an $\tilde{O}(n^{3}$) time algorithm for 2FRP in n-vertex directed graphs with arbitrary edge weights and no negative cycles. As 2FRP is a generalization of the well-studied Replacement Paths problem (RP) that asks for the distances between s and t for any single edge failure, 2FRP is at least as hard as RP. Since RP in graphs with arbitrary weights is equivalent in a fine-grained sense to All-Pairs Shortest Paths (APSP) [Vassilevska Williams and Williams FOCS’10, J. ACM’18], 2FRP is at least as hard as APSP, and thus a substantially subcubic time algorithm in the number of vertices for 2FRP would be a breakthrough. Therefore, our algorithm in $\tilde{O}(n^{3})$ time is conditionally nearly optimal. Our algorithm immediately implies an $\tilde{O}(n^{f+1})$ time algorithm for the more general f FRP problem, giving the first improvement over the straightforward $O(n^{f+2})$ time algorithm.Then we focus on the restriction of 2FRP to graphs with small integer weights bounded by M in absolute values. We show that similar to $\mathrm{R}\mathrm{P}, 2\mathrm{F}\mathrm{R}\mathrm{P}$ has a substantially subcubic time algorithm for small enough M. Using the current best algorithms for rectangular matrix multiplication, we obtain a randomized algorithm that runs in $\tilde{O}(M^{2/3}n^{2.9153})$ time. This immediately implies an improvement over our $\tilde{O}(n^{f+1})$ time arbitrary weight algorithm for all $f\gt1$. We also present a data structure variant of the algorithm that can trade off pre-processing and query time. In addition to the algebraic algorithms, we also give an $n^{8/3-o(1)}$ conditional lower bound for combinatorial 2FRP algorithms in directed unweighted graphs, and more generally, combinatorial lower bounds for the data structure version of $fF\mathrm{R}\mathrm{P}$.
Virginia Vassilevska Williams, Eyob Woldeghebriel, Yinzhan Xu
FOCS2