LCL Problems on Grids

LCL Problems on Grids
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网格拼箱问题

DOI:
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发表时间:
2017
期刊:
ACM SIGACT-SIGOPS Symposium on Principles of Distributed Computing
影响因子:
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通讯作者:
P. Uznański
P. Uznański
中科院分区:
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文献类型:
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作者:
S. Brandt;J. Hirvonen;Janne H. Korhonen;Tuomo Lempiäinen;P. Östergård;Christopher Purcell;Joel Rybicki;J. Suomela;P. Uznański

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LCL或局部可检查标记问题(例如最大独立集,最大匹配和顶点着色)在循环(环形一维网格)中得到了很好的理解:每个问题的复杂度为O(1),Θ(log* n)或Θ(n),并且最优算法的设计可以完全自动化。本文发展了二维环形网格LCL问题的复杂性理论。复杂度类与1维情况相同:O(1),Θ(log* n)和Θ(n)。然而,给定一个LCL问题,它的复杂性是Θ(log* n)还是Θ(n)在二维网格中是不可判定的。然而,如果我们正确地猜测问题的复杂性是Θ(log* n),我们就可以完全自动化最优算法的设计。对于任何问题,我们可以找到一个算法,是一个正常的形式A' o Sk,其中A'是一个有限的功能,Sk是一个算法,找到一个最大的独立集在第k次权力的网格,和k是一个常数。最后,部分自动化设计工具的帮助下,我们分类的复杂性,几个具体的拼箱问题有关的着色和方向。
LCLs or locally checkable labelling problems (e.g. maximal independent set, maximal matching, and vertex colouring) in the LOCAL model of computation are very well-understood in cycles (toroidal 1-dimensional grids): every problem has a complexity of O(1), Θ(log* n), or Θ(n), and the design of optimal algorithms can be fully automated. This work develops the complexity theory of LCL problems for toroidal 2-dimensional grids. The complexity classes are the same as in the 1-dimensional case: O(1), Θ(log* n), and Θ(n). However, given an LCL problem it is undecidable whether its complexity is Θ(log* n) or Θ(n) in 2-dimensional grids. Nevertheless, if we correctly guess that the complexity of a problem is Θ(log* n), we can completely automate the design of optimal algorithms. For any problem we can find an algorithm that is of a normal form A' o Sk, where A' is a finite function, Sk is an algorithm for finding a maximal independent set in kth power of the grid, and k is a constant. Finally, partially with the help of automated design tools, we classify the complexity of several concrete LCL problems related to colourings and orientations.
局部模型中随机复杂性和确定性复杂性之间的指数分离
DOI: 10.1137/17m1117537
发表时间: 2019
影响因子: 1.6
作者:
Chang, Yi-Jun;Kopelowitz, Tsvi;Pettie, Seth
通讯作者: Pettie, Seth
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DOI: 10.1137/17m1157957
发表时间: 2019
影响因子: 1.6
作者:
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