This paper examines the approach taken by team gitastrophe in the CG:SHOP 2021 challenge. The challenge was to find a sequence of simultaneous moves of square robots between two given configurations that minimized either total distance travelled or makespan (total time). Our winning approach has two main components: an initialization phase that finds a good initial solution, and a k-opt local search phase which optimizes this solution. This led to a first place finish in the distance category and a third place finish in the makespan category.
@InProceedings{liu_et_al:LIPIcs.SoCG.2021.64, author = {Liu, Paul and Spalding-Jamieson, Jack and Zhang, Brandon and Zheng, Da Wei}, title = {{Coordinated Motion Planning Through Randomized k-Opt}}, booktitle = {37th International Symposium on Computational Geometry (SoCG 2021)}, pages = {64:1--64:8}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-184-9}, ISSN = {1868-8969}, year = {2021}, volume = {189}, editor = {Buchin, Kevin and Colin de Verdi\`{e}re, \'{E}ric}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.SoCG.2021.64}, URN = {urn:nbn:de:0030-drops-138635}, doi = {10.4230/LIPIcs.SoCG.2021.64}, annote = {Keywords: motion planning, randomized local search, path finding} }
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