Probabilistic Analysis of Optimization Problems on Generalized Random Shortest Path Metrics

Stefan Klootwijk*, Bodo Manthey, Sander K. Visser

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

2 Citations (Scopus)
6 Downloads (Pure)


Simple heuristics often show a remarkable performance in practice for optimization problems. Worst-case analysis often falls short of explaining this performance. Because of this, “beyond worst-case analysis” of algorithms has recently gained a lot of attention, including probabilistic analysis of algorithms. The instances of many optimization problems are essentially a discrete metric space. Probabilistic analysis for such metric optimization problems has nevertheless mostly been conducted on instances drawn from Euclidean space, which provides a structure that is usually heavily exploited in the analysis. However, most instances from practice are not Euclidean. Little work has been done on metric instances drawn from other, more realistic, distributions. Some initial results have been obtained by Bringmann et al. (Algorithmica, 2013), who have used random shortest path metrics on complete graphs to analyze heuristics. The goal of this paper is to generalize these findings to non-complete graphs, especially Erdős–Rényi random graphs. A random shortest path metric is constructed by drawing independent random edge weights for each edge in the graph and setting the distance between every pair of vertices to the length of a shortest path between them with respect to the drawn weights. For such instances, we prove that the greedy heuristic for the minimum distance maximum matching problem, the nearest neighbor and insertion heuristics for the traveling salesman problem, and a trivial heuristic for the k-median problem all achieve a constant expected approximation ratio. Additionally, we show a polynomial upper bound for the expected number of iterations of the 2-opt heuristic for the traveling salesman problem.

Original languageEnglish
Title of host publicationWALCOM
Subtitle of host publicationAlgorithms and Computation - 13th International Conference, WALCOM 2019, Guwahati, India, February 27-March 2, 2019. Proceedings
EditorsShin-ichi Nakano, Gautam K. Das, Partha S. Mandal, Krishnendu Mukhopadhyaya
Place of PublicationCham
Number of pages13
ISBN (Electronic)978-3-030-10564-8
ISBN (Print)978-3-030-10563-1
Publication statusPublished - 1 Jan 2019
Event13th International Conference and Workshop on Algorithms and Computation WALCOM 2019 - IIT Guwahati, Guwahati, India
Duration: 27 Feb 20192 Mar 2019
Conference number: 13

Publication series

NameLecture Notes in Computer Science
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349
NameTheoretical Computer Science and General Issues


Conference13th International Conference and Workshop on Algorithms and Computation WALCOM 2019
Abbreviated titleWALCOM 2019
Internet address


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