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An Improved Upper Bound on Maximal Clique Listing via Rectangular Fast Matrix Multiplication

Abstract : The first output-sensitive algorithm for the Maximal Clique Listing problem was given by Tsukiyama et al. (SIAM J Comput 6(3):505–517, 1977). As any algorithm falling within the Reverse Search paradigm, it performs a DFS visit of a directed tree (the RS-tree) having the objects to be listed (i.e., maximal cliques) as its nodes. In a recursive implementation, the RS-tree corresponds to the recursion tree of the algorithm. The time delay is given by the cost of generating the next child of a node, and Tsukiyama et al. showed it is O(mn). Makino and Uno (in: Hagerup, Katajainen (eds) Algorithm theory: SWAT 2004. Lecture notes in computer science, Springer, Berlin, pp 260–272, 2004) sharpened the time delay to O(n^{\omega }) by generating all the children of a node in one single shot, which is performed by computing a square fast matrix multiplication. In this paper we further improve the asymptotics for the exploration of the same RS-tree by grouping the offsprings’ computation even further. Our idea is to rely on rectangular fast matrix multiplication in order to compute all children of n^2 nodes in one single shot. According to the current upper bounds on square and rectangular fast matrix multiplication, with this the time delay improves from O(n^{2.3728639}) to O(n^{2.093362}), keeping a polynomial work space.
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Submitted on : Sunday, February 13, 2022 - 12:31:43 PM
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Carlo Comin, Romeo Rizzi. An Improved Upper Bound on Maximal Clique Listing via Rectangular Fast Matrix Multiplication. Algorithmica, Springer Verlag, 2018, 80 (12), pp.3525-3562. ⟨10.1007/s00453-017-0402-5⟩. ⟨hal-03570342⟩

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