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Integral Symmetric 2-Commodity Flows

机译:积分对称2-商品流

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摘要

We study integral 2-commodity flows in networks with a special characteristic, namely symmetry. We show that the Symmetric 2-Commodity Flow Problem is in P, by proving that the cut criterion is a necessary and sufficient condition for the existence of a solution. We also give a polynomial-time algorithm whose complexity is 6C_(flow) + O(|A|), where C_(flow) is the time complexity of your favorite flow algorithm (usually in O(|V| x|A|)). Our result closes an open question in a surprising way, since it is known that the Integral 2-Commodity Flow Problem is NP-complete for both directed and undirected graphs. This work finds application in optical telecommunication networks.
机译:我们研究具有特殊特征(即对称性)的网络中的积分2商品流。通过证明割准则是解的存在的必要和充分条件,我们证明了对称2-商品流问题在P中。我们还给出了多项式时间算法,其复杂度为6C_(flow)+ O(| A |),其中C_(flow)是您最喜欢的流算法的时间复杂度(通常为O(| V | x | A |) )。我们的结果以令人惊讶的方式结束了一个悬而未决的问题,因为众所周知,有向图和无向图的积分2商品流问题都是NP完全的。这项工作在光通信网络中得到了应用。

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