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FOCS

2003

IEEE

2003

IEEE

A directed multigraph is said to be d-regular if the indegree and outdegree of every vertex is exactly d. By Hall’s theorem one can represent such a multigraph as a combination of at most n2 cycle covers each taken with an appropriate multiplicity. We prove that if the d-regular multigraph does not contain more than ⌊d/2⌋ copies of any 2-cycle then we can ﬁnd a similar decomposition into n2 pairs of cycle covers where each 2-cycle occurs in at most one component of each pair. Our proof is constructive and gives a polynomial algorithm to ﬁnd such a decomposition. Since our applications only need one such a pair of cycle covers whose weight is at least the average weight of all pairs, we also give an alternative, simpler algorithm to extract a single such pair. This combinatorial theorem then comes handy in rounding a fractional solution of an LP relaxation of the maximum Traveling Salesman Problem (TSP) problem. The ﬁrst stage of the rounding procedure obtains two cycle cov...

Added |
04 Jul 2010 |

Updated |
04 Jul 2010 |

Type |
Conference |

Year |
2003 |

Where |
FOCS |

Authors |
Haim Kaplan, Moshe Lewenstein, Nira Shafrir, Maxim Sviridenko |

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