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arXiv cs/0504101cs.AIcs.CCcs.DM
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单解随机3- SAT方程

Single-solution Random 3-SAT Instances

Marko Znidaric

摘要:

研究了一类具有唯一解的随机3-SAT问题.这个合奏的属性显着不同的随机3-SAT合奏。数值结果表明,几种完全和随机局部搜索算法的运行时间随着子句密度的减小而单调增加。因此,不存在如标准随机3-SAT系综那样的易-硬-易硬度模式。此外,短的单解公式的运行时间随着问题的大小增加比随机3-SAT公式从相变区域快得多。

英文摘要:

We study a class of random 3-SAT instances having exactly one solution. The properties of this ensemble considerably differ from those of a random 3-SAT ensemble. It is numerically shown that the running time of several complete and stochastic local search algorithms monotonically increases as the clause density is decreased. Therefore, there is no easy-hard-easy pattern of hardness as for standard random 3-SAT ensemble. Furthermore, the running time for short single-solution formulas increases with the problem size much faster than for random 3-SAT formulas from the phase transition region.

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