The median problems for breakpoints are NP-complete

  title={The median problems for breakpoints are NP-complete},
  author={Itsik Pe'er and Ron Shamir},
  journal={Electronic Colloquium on Computational Complexity (ECCC)},
The breakpoint distance between two n-permutations is the number of pairs that appear consecutively in one but not in the other. In the median problem for breakpoints one is given a set of permutations and has to construct a permutation that minimizes the sum of breakpoint distances to all the original ones. Recently, the problem was suggested as a model for determining the evolutionary history of several species based on their gene orders. We show that the problem is already NP-hard for three… CONTINUE READING
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