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arXiv 0911.2322cs.DMcs.CCcs.DS
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随机约束满足问题

Random Constraint Satisfaction Problems

Amin Coja-Oghlan

摘要:

约束满足问题的随机实例,如k-SAT提供了具有挑战性的基准。如果在n个变量上有m个约束,则通常存在大范围的密度r=m/n,其中由于非构造性参数,已知解以接近1的概率存在。然而,没有算法是已知的,找到解决方案,有效地与非零概率,甚至在低得多的密度。这一事实似乎与所有解决方案中的相变有关。这个扩展的抽象的目标是提供一个对这种现象的看法,以及它所带来的计算挑战。

英文摘要:

Random instances of constraint satisfaction problems such as k-SAT provide challenging benchmarks. If there are m constraints over n variables there is typically a large range of densities r=m/n where solutions are known to exist with probability close to one due to non-constructive arguments. However, no algorithms are known to find solutions efficiently with a non-vanishing probability at even much lower densities. This fact appears to be related to a phase transition in the set of all solutions. The goal of this extended abstract is to provide a perspective on this phenomenon, and on the computational challenge that it poses.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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