计算机科学 ›› 2007, Vol. 34 ›› Issue (10): 219-220.

• 软件工程与数据库技术 • 上一篇    下一篇

集合多覆盖问题的乘性权重更新分析

  

  • 出版日期:2018-11-16 发布日期:2018-11-16

  • Online:2018-11-16 Published:2018-11-16

摘要: 集合多覆盖问题的简单贪心算法的近似比是lnn+1。本文提出简单贪心算法的一个变形,宽度优先贪心算法,并且证明其有近似比(lnn)/r+lnlnn+O(1),其中r是覆盖要求。这个结果比由随机取整方法得到的近似比O((lnn)/r+√(lnn)+1为优。宽度优先贪心算法的设计可以归入Arora等最近提出的乘性权重更新方法的框架。关键词集合多覆盖,宽度优先贪心算法,乘性权重更新方法

关键词: 集合多覆盖 宽度优先贪心算法 乘性权重更新方法

Abstract: The simple greedy algorithm for set multicover has approximation ratio. This paper presents a variation of the simple greedy algorithm, Breadth First Greedy Algorithm, and proves its approximation ratio can be (ln n)/r+ lnlnn+O(1), where r is the cover re

Key words: Set multicover, Breadth first greedy algorithm, Multiplicative weights update method

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