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A. Botea and P. Surynek. Multi-Agent Path Finding on Strongly Biconnected Digraphs. In Proceedings of the AAAI Conference on Artificial Intelligence (AAAI), pages 2024-2030, 2015.

Abstract: Much of the literature on multi-agent path finding focuses on undirected graphs, where motion is permitted in both directions along a graph edge. Despite this, travelling on directed graphs is relevant in navigation domains, such as pathfinding in games, and asymmetric communication networks. We consider multi-agent path finding on strongly biconnected directed graphs. We show that all instances with at least two unoccupied positions can be solved or proven unsolvable. We present a polynomial-time algorithm for this class of problems, and analyze its complexity. Our work may be the first formal study of multi-agent path finding on directed graphs.

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(last updated in 2022)