A Tight Lower Bound for an Online Hypercube Packing Problem and Bounds for Prices of Anarchy of a Related Game

  • Yoshiharu Kohayakawa
  • Flávio Keidi Miyazawa
  • Yoshiko Wakabayashi
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 10807)


We prove a tight lower bound on the asymptotic performance ratio \(\rho \) of the bounded space online d-hypercube bin packing problem, solving an open question raised in 2005. In the classic d-hypercube bin packing problem, we are given a sequence of d-dimensional hypercubes and we have an unlimited number of bins, each of which is a d-dimensional unit hypercube. The goal is to pack (orthogonally) the given hypercubes into the minimum possible number of bins, in such a way that no two hypercubes in the same bin overlap. The bounded space online d-hypercube bin packing problem is a variant of the d-hypercube bin packing problem, in which the hypercubes arrive online and each one must be packed in an open bin without the knowledge of the next hypercubes. Moreover, at each moment, only a constant number of open bins are allowed (whenever a new bin is used, it is considered open, and it remains so until it is considered closed, in which case, it is not allowed to accept new hypercubes). Epstein and van Stee (SIAM J Comput 35(2):431–448, 2005) showed that \(\rho \) is \(\varOmega (\log d)\) and \(O(d/\log d)\), and conjectured that it is \(\varTheta (\log d)\). We show that \(\rho \) is in fact \(\varTheta (d/\log d)\). To obtain this result, we elaborate on some ideas presented by those authors, and go one step further showing how to obtain better (offline) packings of certain special instances for which one knows how many bins any bounded space algorithm has to use. Our main contribution establishes the existence of such packings, for large enough d, using probabilistic arguments. Such packings also lead to lower bounds for the prices of anarchy of the selfish d-hypercube bin packing game. We present a lower bound of \(\varOmega (d/\log d)\) for the pure price of anarchy of this game, and we also give a lower bound of \(\varOmega (\log d)\) for its strong price of anarchy.



We thank the referees for helpful suggestions.


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Authors and Affiliations

  1. 1.Institute of Mathematics and StatisticsUniversity of São PauloSão PauloBrazil
  2. 2.Institute of ComputingUniversity of CampinasCampinasBrazil

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