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On the maximum disjoint paths problem on edge-colored graphs

机译:关于边色图的最大不相交路径问题

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We study the problem of finding the maximum number of disjoint uni-color paths in an edge-colored graph. We show the NP-hardness and the approximability and present approximation and exact algorithms. We also study the length-bounded version of the problem, in which the numbers of edges of the found paths are required to be upper bounded by a fixed integer l. It is shown that the problem can be solved in polynomial time for l≤3 and is NP-hard for l<4. We also show that the problem can be approximated with ratio (l-1)2+ε in polynomial time for any ε>0. Particularly, for l=4, we present an efficient 2-approximation algorithm.
机译:我们研究在边缘彩色图中找到最大不相交单色路径的问题。我们展示了NP硬度和逼近度,并给出了逼近和精确算法。我们还研究了问题的有界版本,在该版本中,所找到路径的边数要求以固定整数l为上限。结果表明,对于l≤3,可以在多项式时间内解决,对于l <4,则是NP-难的。我们还表明,对于任意ε> 0,该问题都可以用多项式时间内的比率(l-1)2 +ε来近似。特别地,对于l = 4,我们提出了一种有效的2近似算法。

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