Streaming Weighted Matchings: Optimal Meets Greedy
Streaming Weighted Matchings: Optimal Meets Greedy
复制标题
流式加权匹配:最优与贪婪的结合
DOI:
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发表时间:
2016
期刊:
影响因子:
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通讯作者:
Samson Zhou
中科院分区:
文献类型:
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作者:
Elena Grigorescu;M. Monemizadeh;Samson Zhou
We consider the problem of approximating a maximum weighted matching, when the edges of an underlying weighted graph $G(V,E)$ are revealed in a streaming fashion. We analyze a variant of the previously best-known $(4+epsilon)$-approximation algorithm due to Crouch and Stubbs (APPROX, 2014), and prove their conjecture that it achieves a tight approximation factor of $3.5+epsilon$.
The algorithm splits the stream into substreams on which it runs a greedy maximum matching algorithm. At the end of the stream, the selected edges are given as input to an optimal maximum weighted matching algorithm. To analyze the approximation guarantee, we develop a novel charging argument in which we decompose the edges of a maximum weighted matching of $G$ into a few natural classes, and then charge them separately to the edges of the matching output by our algorithm.
DOI:
10.1145/3230819
发表时间:
2015
期刊:
ACM Transactions on Algorithms (TALG)
影响因子:
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作者:
Hossein Esfandiari;Mohammad Taghi Hajiaghayi;Vahid Liaghat;Morteza Monemizadeh;Krzysztof Onak
通讯作者:
Krzysztof Onak