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首页> 外文期刊>LIPIcs : Leibniz International Proceedings in Informatics >Efficient and Adaptive Parameterized Algorithms on Modular Decompositions
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Efficient and Adaptive Parameterized Algorithms on Modular Decompositions

机译:模块化分解的高效自适应参数化算法

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We study the influence of a graph parameter called modular-width on the time complexity for optimally solving well-known polynomial problems such as Maximum Matching, Triangle Counting, and Maximum s-t Vertex-Capacitated Flow. The modular-width of a graph depends on its (unique) modular decomposition tree, and can be computed in linear time O(n+m) for graphs with n vertices and m edges. Modular decompositions are an important tool for graph algorithms, e.g., for linear-time recognition of certain graph classes.Throughout, we obtain efficient parameterized algorithms of running times O(f(mw)n+m), O(n+f(mw)m) , or O(f(mw)+n+m) for low polynomial functions f and graphs of modular-width mw. Our algorithm for Maximum Matching, running in time O(mw^2 log mw n+m), is both faster and simpler than the recent O(mw^4n+m) time algorithm of Coudert et al. (SODA 2018). For several other problems, e.g., Triangle Counting and Maximum b-Matching, we give adaptive algorithms, meaning that their running times match the best unparameterized algorithms for worst-case modular-width of mw=Theta(n) and they outperform them already for mw=o(n), until reaching linear time for mw=O(1).
机译:我们研究了一种称为模数宽度的图形参数对时间复杂度的影响,以最佳地解决众所周知的多项式问题,例如最大匹配,三角形计数和最大s-t顶点容量流。图的模宽取决于其(唯一)模分解树,对于具有n个顶点和m个边的图,可以在线性时间O(n + m)中计算。模块化分解是用于图算法的重要工具,例如用于某些图类的线性时间识别。贯穿全文,我们获得了运行时间O(f(mw)n + m),O(n + f(mw)的有效参数化算法)m)或O(f(mw)+ n + m)用于低多项式函数f和模宽度mw的图。我们的最大匹配算法在时间O(mw ^ 2 log mw n + m)上运行,比最近的Coudert等人的O(mw ^ 4n + m)时间算法更快,更简单。 (SODA 2018)。对于其他一些问题,例如“三角形计数”和“最大b匹配”,我们给出了自适应算法,这意味着对于mw = Theta(n)的最坏情况模块化宽度,它们的运行时间与最佳非参数化算法匹配,并且它们在性能上已经超过了它们mw = o(n),直到达到mw = O(1)的线性时间为止。

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