Optimal online bounded space multidimensional packing

  • Authors:
  • Leah Epstein;Rob van Stee

  • Affiliations:
  • The Interdisciplinary Center, Herzliya, Israel;Centre for Mathematics and Computer Science (CWI), Amsterdam, The Netherlands

  • Venue:
  • SODA '04 Proceedings of the fifteenth annual ACM-SIAM symposium on Discrete algorithms
  • Year:
  • 2004

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Abstract

We solve an open problem in the literature by providing an online algorithm for multidimensional bin packing that uses only bounded space. To achieve this, we introduce a new technique for classifying the items to be packed. We show that our algorithm is optimal among bounded space algorithms for any dimension d 1. Its asymptotic performance ratio is (II∞)d, where II∞ ≈ 1:691 is the asymptotic performance ratio of the one-dimensional algorithm HARMONIC. A modified version of this algorithm for the case where all items are hypercubes is also shown to be optimal. Its asymptotic performance ratio is sublinear in d.Additionally, for the special case of packing squares in two-dimensional bins, we present a new unbounded space online algorithm with asymptotic performance ratio of at most 2.271. We also present an approximation algorithm for the offline problem with approximation ratio of 16/11.