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arXiv 1202.2654math.OC
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凹代价组合最优化问题的强多项式原始对偶法

Strongly Polynomial Primal-Dual Algorithms for Concave Cost Combinatorial Optimization Problems

Thomas L. Magnanti, Dan Stratila

摘要:

针对一类具有凹代价的组合最优化问题,提出了一种算法设计技术。这种技术产生一个强多项式原始对偶法的凹成本问题,只要这样的算法存在的固定费用对应的问题。对于许多实际的凹费用问题,固定费用问题是一个研究得很好的组合最优化问题。我们的技术保留常数因子近似比,以及仅取决于某些问题参数的比率,精确算法产生精确算法。利用我们的技术,我们得到了一个新的1.61近似算法的凹成本设施定位问题。对于库存问题,我们得到了具有一般凹订货费用的经济批量问题的一个新的精确算法,以及具有一般凹个体订货费用的联合补货问题的一个4-近似算法.

英文摘要:

We introduce an algorithm design technique for a class of combinatorial optimization problems with concave costs. This technique yields a strongly polynomial primal-dual algorithm for a concave cost problem whenever such an algorithm exists for the fixed-charge counterpart of the problem. For many practical concave cost problems, the fixed-charge counterpart is a well-studied combinatorial optimization problem. Our technique preserves constant factor approximation ratios, as well as ratios that depend only on certain problem parameters, and exact algorithms yield exact algorithms. Using our technique, we obtain a new 1.61-approximation algorithm for the concave cost facility location problem. For inventory problems, we obtain a new exact algorithm for the economic lot-sizing problem with general concave ordering costs, and a 4-approximation algorithm for the joint replenishment problem with general concave individual ordering costs.

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