A constant-factor approximation algorithm for the asymmetric traveling salesman problem

A constant-factor approximation algorithm for the asymmetric traveling salesman problem
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非对称旅行商问题的常因子逼近算法

DOI:
10.1145/3188745.3188824
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发表时间:
2018
期刊:
--
影响因子:
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通讯作者:
Svensson O
Svensson O
中科院分区:
--
文献类型:
--
作者:
Svensson O

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针对不对称旅行商问题,给出了一种常因子逼近算法。对标准LP松弛的近似保证进行了分析,从而证实了该松弛的常积分间隙的推测。我们的方法的主要思想是减少Subtour Partition Cover,这是一个更容易的问题,通过显着放宽一般连通性要求到局部连通性条件。我们首先证明了任何Subtour Partition Cover算法都可以转化为ATSP算法,而在性能保证中只损失一个很小的常数因子。接下来,我们提出了从一般ATSP实例到结构化实例的约简,然后在此基础上我们求解Subtour Partition Cover,得到我们的ATSP常因子近似算法。
We give a constant-factor approximation algorithm for the asymmetric traveling salesman problem (ATSP). Our approximation guarantee is analyzed with respect to the standard LP relaxation, and thus our result confirms the conjectured constant integrality gap of that relaxation.The main idea of our approach is a reduction to Subtour Partition Cover, an easier problem obtained by significantly relaxing the general connectivity requirements into local connectivity conditions. We first show that any algorithm for Subtour Partition Cover can be turned into an algorithm for ATSP while only losing a small constant factor in the performance guarantee. Next, we present a reduction from general ATSP instances to structured instances, on which we then solve Subtour Partition Cover, yielding our constant-factor approximation algorithm for ATSP.
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