Finding Adam in random growing trees
Finding Adam in random growing trees
复制标题
在随机生长的树中寻找亚当
DOI:
10.1002/rsa.20649
复制
发表时间:
2014
影响因子:
1
通讯作者:
G. Lugosi
中科院分区:
文献类型:
--
作者:
Sébastien Bubeck;L. Devroye;G. Lugosi
We investigate algorithms to find the first vertex in large trees generated by either the uniform attachment or preferential attachment model. We require the algorithm to output a set of K vertices, such that, with probability at least 1−ε , the first vertex is in this set. We show that for any ε, there exist such algorithms with K independent of the size of the input tree. Moreover, we provide almost tight bounds for the best value of K as a function of ε. In the uniform attachment case we show that the optimal K is subpolynomial in 1/ε , and that it has to be at least superpolylogarithmic. On the other hand, the preferential attachment case is exponentially harder, as we prove that the best K is polynomial in 1/ε . We conclude the paper with several open problems. © 2016 Wiley Periodicals, Inc. Random Struct. Alg., 50, 158–172, 2017
DOI:
10.1214/16-aap1212
发表时间:
2017
期刊:
The Annals of Applied Probability
影响因子:
--
作者:
Frieze, Alan;Pegden, Wesley
通讯作者:
Pegden, Wesley