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arXiv 2302.05161math.OC
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二部流动推销员问题:一个可解的情形

The bipartite travelling salesman problem: A pyramidally solvable case

Vladimir G. Deineko, Bettina Klinz, Gerhard J. Woeginger

摘要:

在二分流动推销员问题(BTSP)中,我们给出了$n=2k$城市以及$n\times n$距离矩阵,并将城市划分为$k$红色和$k$蓝色城市。任务是找到一个最短的旅游,交替访问蓝色和红色的城市。我们认为BTSP限制到所谓的Van der Veen距离矩阵的类。我们表明,这种情况下仍然是NP-困难的一般,但成为可解的多项式时间时,所有的奇数指数的顶点是蓝色的,所有的偶数指数是红色的。在后一种情况下,可以在$O(n^2)$时间内在金字塔形路线的集合中找到最优解。

英文摘要:

In the bipartite travelling salesman problem (BTSP), we are given $n=2k$ cities along with an $n\times n$ distance matrix and a partition of the cities into $k$ red and $k$ blue cities. The task is to find a shortest tour which alternately visits blue and red cities. We consider the BTSP restricted to the class of so-called Van der Veen distance matrices. We show that this case remains NP-hard in general but becomes solvable in polynomial time when all vertices with odd indices are coloured blue and all with even indices are coloured red. In the latter case an optimal solution can be found in $O(n^2)$ time among the set of pyramidal tours.

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