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Zeros of Holant Problems: Locations and Algorithms

期刊: ACM TRANSACTIONS ON ALGORITHMS, 2021; 17 (1)

We present fully polynomial-time (deterministic or randomised) approximation schemes for Holant problems, defined by a non-negative constraint functio......

Approximating Spanners and Directed Steiner Forest: Upper and Lower Bounds

期刊: ACM TRANSACTIONS ON ALGORITHMS, 2020; 16 (3)

It was recently found that there are very close connections between the existence of additive spanners (sub-graphs where all distances are preserved u......

A Unified PTAS for Prize Collecting TSP and Steiner Tree Problem in Doubling Metrics

期刊: ACM TRANSACTIONS ON ALGORITHMS, 2020; 16 (2)

We present a unified (randomized) polynomial-time approximation scheme (PTAS) for the prize collecting traveling salesman problem (PCTSP) and the priz......

Scheduling When You Do Not Know the Number of Machines

期刊: ACM TRANSACTIONS ON ALGORITHMS, 2020; 16 (1)

Often in a scheduling problem, there is uncertainty about the jobs to be processed. The issue of uncertainty regarding the machines has been much less......

A Time- and Message-Optimal Distributed Algorithm for Minimum Spanning Trees

期刊: ACM TRANSACTIONS ON ALGORITHMS, 2020; 16 (1)

This article presents a randomized (Las Vegas) distributed algorithm that constructs a minimum spanning tree (MST) in weighted networks with optimal (......

Distributed Edge Coloring and a Special Case of the Constructive Lovasz Local Lemma

期刊: ACM TRANSACTIONS ON ALGORITHMS, 2020; 16 (1)

The complexity of distributed edge coloring depends heavily on the palette size as a function of the maximum degree Delta. In this article, we explore......

Distribution-free Junta Testing

期刊: ACM TRANSACTIONS ON ALGORITHMS, 2019; 15 (1)

We study the problem of testing whether an unknown n-variable Boolean function is a k-junta in the distribution-free property testing model, where the......

JIF:0.82

Online Vertex-Weighted Bipartite Matching: Beating 1-1/e with Random Arrivals

期刊: ACM TRANSACTIONS ON ALGORITHMS, 2019; 15 (3)

We introduce a weighted version of the ranking algorithm by Karp et al. (STOC 1990), and we prove a competitive ratio of 0.6534 for the vertex-weighte......

JIF:0.82

Scaling Algorithms for Weighted Matching in General Graphs

期刊: ACM TRANSACTIONS ON ALGORITHMS, 2018; 14 (1)

We present a new scaling algorithm for maximum (or minimum) weight perfect matching on general, edge weighted graphs. Our algorithm runs in O(m root n......

JIF:0.82

Primal Dual Gives Almost Optimal Energy-Efficient Online Algorithms

期刊: ACM TRANSACTIONS ON ALGORITHMS, 2018; 14 (1)

We consider the problem of online scheduling of jobs on unrelated machines with dynamic speed scaling to minimize the sum of energy and weighted flow-......

JIF:0.82

Reducing Curse of Dimensionality: Improved PTAS for TSP (with Neighborhoods) in Doubling Metrics

期刊: ACM TRANSACTIONS ON ALGORITHMS, 2018; 14 (1)

We consider the Traveling Salesman Problem with Neighborhoods (TSPN) in doubling metrics. The goal is to find the shortest tour that visits each of a ......

JIF:0.82

Packing Groups of Items into Multiple Knapsacks

期刊: ACM TRANSACTIONS ON ALGORITHMS, 2018; 14 (4)

We consider a natural generalization of the classical multiple knapsack problem in which instead of packing single items we are packing groups of item......

JIF:0.82

Online Submodular Maximization with Free Disposal

期刊: ACM TRANSACTIONS ON ALGORITHMS, 2018; 14 (4)

We study the online submodular maximization problem with free disposal under a matroid constraint. Elements from some ground set arrive one by one in ......

JIF:0.82

Tight Space Bounds for Two-Dimensional Approximate Range Counting

期刊: ACM TRANSACTIONS ON ALGORITHMS, 2018; 14 (2)

We study the problem of two-dimensional orthogonal range counting with additive error. Given a set P of n points drawn from an n x n grid and an error......

JIF:0.82

Analyzing Node-Weighted Oblivious Matching Problem via Continuous LP with Jump Discontinuity

期刊: ACM TRANSACTIONS ON ALGORITHMS, 2018; 14 (2)

We prove the first non-trivial performance ratio strictly above 0.5 for the weighted Ranking algoritlun on the oblivious matching problem where nodes ......

JIF:0.82

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