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:
影响因子:
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通讯作者:
P. Uznański
中科院分区:
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
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.
影响因子:
1.6
作者:
Chang, Yi-Jun;Kopelowitz, Tsvi;Pettie, Seth
通讯作者:
Pettie, Seth
影响因子:
1.6
作者:
Chang, Yi-Jun;Pettie, Seth
通讯作者:
Pettie, Seth