Large Cuts with Local Algorithms on Triangle-Free Graphs
Large Cuts with Local Algorithms on Triangle-Free Graphs
复制标题
在无三角形图上使用局部算法进行大切割
DOI:
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发表时间:
2014
影响因子:
0.7
通讯作者:
J. Suomela
中科院分区:
文献类型:
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作者:
J. Hirvonen;Joel Rybicki;S. Schmid;J. Suomela
We study the problem of finding large cuts in $d$-regular triangle-free graphs. In prior work, Shearer (1992) gives a randomised algorithm that finds a cut of expected size $(1/2 + 0.177/sqrt{d})m$, where $m$ is the number of edges. We give a simpler algorithm that does much better: it finds a cut of expected size $(1/2 + 0.28125/sqrt{d})m$. As a corollary, this shows that in any $d$-regular triangle-free graph there exists a cut of at least this size.
Our algorithm can be interpreted as a very efficient randomised distributed algorithm: each node needs to produce only one random bit, and the algorithm runs in one synchronous communication round. This work is also a case study of applying computational techniques in the design of distributed algorithms: our algorithm was designed by a computer program that searched for optimal algorithms for small values of $d$.