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An exact algorithm for general, orthogonal, two-dimensional knapsack problems. (English) Zbl 0903.90124
Summary: We present a new exact tree-search procedure for solving two-dimensional knapsack problems in which a number of small rectangular pieces, each of a given size and value, are required to be cut from a large rectangular stock plate. The objective is to maximize the value of pieces cut or minimize the wastage. We consider the case where there is a maximum number of times that a piece may be used in a cutting pattern. The algorithm limits the size of the tree search by using a bound derived from a Lagrangean relaxation of a 0-1 integer programming formulation of the problem. Subgradient optimization is used to optimize this bound. Reduction tests derived from both the original problem and the Lagrangean relaxation produce substantial computational gains. The computational performance of the algorithm indicates that it is an effective procedure capable of solving optimally practical two-dimensional cutting problems of medium size.

MSC:
90C10 Integer programming
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