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A. Gilbert

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Preprint Sep 2026

Scalable Triangle Counting: The Threshold Algorithm

We study one-pass triangle counting on random-order edge streams. We present a remarkably simple algorithm---read edges from the stream until $Q$ triangles are observed in the prefix, then output $Q\,(m/S)^3$ where $S$ is the stopping length---and prove that, when the maximum number of triangles incident to any edge sa...

Asaf Etgar, A. Gilbert, Quan-Quan C. Liu et al. · 0 citations
Preprint Sep 2026

Parameter-Free Triangle Counting

Given an undirected, unweighted graph $G = (V,E)$ with $n$ vertices and $m$ edges, the triangle counting problem seeks the number of three-cycles in it. Triangle and subgraph counting are classical problems in graph algorithms, central to applications such as community detection, computing the clustering coefficient, m...

Asaf Etgar, A. Gilbert, Quan-Quan C. Liu et al. · 0 citations
Preprint Aug 2026

Metric repair is two problems: Which edges, and what weights

This work implements a suite of algorithms, covering the literature and new methods, both with theoretical guarantees and heuristics, and evaluates their performance on real and synthetic data, both inherently non metric and corrupted, demonstrating that the algorithms' performance is determined predominantly by the ty...

Asaf Etgar, A. Gilbert · 0 citations
Jul 2026

Structural Tractability Frontiers for Metric Repair

This paper asks what structural properties of the graph itself make metric repair tractable, and gives pseudo-polynomial time algorithms for series-parallel graphs, and by generalization, graphs of bounded treewidth and a new algorithm for the length-bounded multicut problem.

Asaf Etgar, A. Gilbert, Jamie Tucker-Foltz · 0 citations

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