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Tight absolute bound for First Fit Decreasing bin-packing: FFD(L)≤11/9OPT(L)+6/9
Theoretical Computer Science
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Journal of Combinatorial Optimization
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First Fit Decreasing is a classical bin packing algorithm: the items are ordered into their nonincreasing order, and then in this order the next item is always packed into the first bin where it fits. For an instance I let FFD(I) and OPT(I) denote the number of the used bins by algorithm FFD, and an optimal algorithm, respectively. We show in this paper that FFD(I) ≤ 11/9OPT(I) + 6/9, (1) and that this bound is tight. The tight bound of the additive constant was an open question for many years.