How to rank with few errors

@inproceedings{Mathieu2007HowTR,
  title={How to rank with few errors},
  author={Claire Mathieu and Warren Schudy},
  booktitle={STOC '07},
  year={2007}
}
We present a polynomial time approximation scheme (PTAS) for the minimum feedback arc set problem on tournaments. A simple weighted generalization gives a PTAS for Kemeny-Young rank aggregation. 

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