Abstract
Motivated by issues of minimizing energy consumption, we study variable sized bin packing with general costs. In this problem we are given an unlimited supply of bins of different types. A bin of each type has a size and a cost. A set of items is given, where each item has a size in (0,1]. The goal is to assign the items to bins, so that the total cost is minimized. It is allowed to use multiple instances of any of the bin types, but this counts towards the total cost. The problem is general as the cost of a bin has no relation to its size. We design an AFPTAS for the problem by introducing new reduction methods and separation techniques, thus providing new insights into this interesting optimization problem. Furthermore, we use this AFPTAS to provide an AFPTAS for the bin packing with bin utilization cost problem.
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