Reversal Distance without Hurdles and Fortresses

  title={Reversal Distance without Hurdles and Fortresses},
  author={Anne Bergeron and Julia Mixtacki and Jens Stoye},
This paper presents an elementary proof of the HannenhalliPevzner theorem on the reversal distance of two signed permutations. It uses a single PQ-tree to encode the various features of a permutation. The parameters called hurdles and fortress are replaced by a single one, whose value is computed by a simple and efficient algorithm. 

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