The interval ordering problem

  • Authors:

  • Christoph Dürr;Maurice Queyranne;Frits C. R. Spieksma;Fabrice Talla Nobibon;Gerhard J. Woeginger

  • Affiliations:

  • CNRS, Université Pierre et Marie Curie, LIP6, F-75252 Paris Cedex 05, France;Sauder School of Business at the University of British Columbia, Vancouver, Canada and CNRS, France;University of Leuven, Operations Research Group, Naamsestraat 69, B-3000 Leuven, Belgium;PostDoc researcher for Research Foundation Flanders, Center for Operations Research and Business Statistics (ORSTAT), Faculty of Business and Economics, KULeuven, Leuven, Belgium and Scientific co ...;Technical University of Eindhoven, Netherlands

  • Venue:
  • Discrete Applied Mathematics
  • Year:
  • 2012

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Abstract

For a given set of intervals on the real line, we consider the problem of ordering the intervals with the goal of minimizing an objective function that depends on the exposed interval pieces (that is, the pieces that are not covered by earlier intervals in the ordering). This problem is motivated by an application in molecular biology that concerns the determination of the structure of the backbone of a protein. We present polynomial-time algorithms for several natural special cases of the problem that cover the situation where the interval boundaries are agreeably ordered and the situation where the interval set is laminar. Also the bottleneck variant of the problem is shown to be solvable in polynomial time. Finally we prove that the general problem is NP-hard, and that the existence of a constant-factor-approximation algorithm is unlikely.