2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/31154Falmagne recently introduced the concept of a medium, a combinatorial object encompassing hyperplane arrangements, topological orderings, acyclic orientations, and many other familiar structures. We find efficient solutions for several algorithmic problems on media: finding short reset sequences, shortest paths, testing whether a medium has a closed orientation, and listing the states of a medium given a black-box description.12 pagesData Structures and AlgorithmsF.2.2text