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arXiv 1010.2997math.COcs.DMmath.PR
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在线性时间内以高概率发现隐藏集团

Finding Hidden Cliques in Linear Time with High Probability

Yael Dekel, Ori Gurel-Gurevich, Yuval Peres

摘要:

给出了一个具有$n$顶点的图$G$,其中$k$顶点的随机子集被构造成一个团,其余的边以概率$\tfrac12$被独立地选择.该随机图模型表示为$G(n,\tfrac12,k)$。隐藏团问题是设计一种算法,以高概率在多项式时间内找到$k$ -团。一个算法,由于阿隆,Krivelevich和Sudakov使用频谱技术,以找到隐藏集团的高概率时,$k = c \sqrt{n}$为一个足够大的常数$c > 0$。最近,Feige和Ron提出了一个解决同样问题的算法。它具有更简单、更直观的优点,并改善了$O(n^2)$的运行时间。然而,本文的分析仅给出了$2/3$的成功概率。在本文中,我们提出了一种用于查找隐藏集团的新算法,该算法既在时间$O(n^2)$中运行,又具有小于多项式小的失败概率。

英文摘要:

We are given a graph $G$ with $n$ vertices, where a random subset of $k$ vertices has been made into a clique, and the remaining edges are chosen independently with probability $\tfrac12$. This random graph model is denoted $G(n,\tfrac12,k)$. The hidden clique problem is to design an algorithm that finds the $k$-clique in polynomial time with high probability. An algorithm due to Alon, Krivelevich and Sudakov uses spectral techniques to find the hidden clique with high probability when $k = c \sqrt{n}$ for a sufficiently large constant $c > 0$. Recently, an algorithm that solves the same problem was proposed by Feige and Ron. It has the advantages of being simpler and more intuitive, and of an improved running time of $O(n^2)$. However, the analysis in the paper gives success probability of only $2/3$. In this paper we present a new algorithm for finding hidden cliques that both runs in time $O(n^2)$, and has a failure probability that is less than polynomially small.

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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