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arXiv 2108.13060cs.DS
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逼近TTP-2的进一步改进

A Further Improvement on Approximating TTP-2

Jingyang Zhao, Mingyu Xiao

摘要:

巡回赛问题(TTP)是一个困难但有趣的运动调度问题,其灵感来自于美国职业棒球大联盟,即设计一个双循环赛时间表,使得每对球队在对方的主场进行一场比赛,最小化所有$n$球队的总距离($n$是偶数)。在本文中,我们考虑TTP-2,即,TTP还有一个限制,每支球队最多可以有两个连续的主场比赛或客场比赛。由于不同的结构特性,对于$n/2$是奇数和偶数,TTP-2的已知算法是不同的。对于奇数$n/2$,最佳已知近似比约为$(1+12/n)$,而对于偶数$n/2$,最佳已知近似比约为$(1+4/n)$。本文在$n/2$为偶数的情况下,进一步改进了由$(1+4/n)$到$(1+3/n)$的逼近比.在基准集上的实验结果表明,我们的算法可以将之前对所有偶数$n/2$实例的结果提高$1\%$到$4\%$ .

英文摘要:

The Traveling Tournament Problem (TTP) is a hard but interesting sports scheduling problem inspired by Major League Baseball, which is to design a double round-robin schedule such that each pair of teams plays one game in each other's home venue, minimizing the total distance traveled by all $n$ teams ($n$ is even). In this paper, we consider TTP-2, i.e., TTP with one more constraint that each team can have at most two consecutive home games or away games. Due to the different structural properties, known algorithms for TTP-2 are different for $n/2$ being odd and even. For odd $n/2$, the best known approximation ratio is about $(1+12/n)$, and for even $n/2$, the best known approximation ratio is about $(1+4/n)$. In this paper, we further improve the approximation ratio from $(1+4/n)$ to $(1+3/n)$ for $n/2$ being even. Experimental results on benchmark sets show that our algorithm can improve previous results on all instances with even $n/2$ by $1\%$ to $4\%$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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