Controlled non-uniform random generation of decomposable structures

  • Authors:
  • A. Denise;Y. Ponty;M. Termier

  • Affiliations:
  • LRI, Université Paris-Sud, CNRS, INRIA AMIB. Bat 490, 91405 Orsay cedex, France and IGM, Université Paris-Sud CNRS. Bat. 400, 91405 Orsay cedex, France;LRI, Université Paris-Sud, CNRS, INRIA AMIB. Bat 490, 91405 Orsay cedex, France and LIX, Ecole Polytechnique, CNRS, INRIA AMIB. 91128 Palaiseau cedex, France;IGM, Université Paris-Sud CNRS. Bat. 400, 91405 Orsay cedex, France

  • Venue:
  • Theoretical Computer Science
  • Year:
  • 2010

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Abstract

Consider a class of decomposable combinatorial structures, using different types of atoms Z={Z"1,...,Z"|"Z"|}. We address the random generation of such structures with respect to a size n and a targeted distribution in k of its distinguished atoms. We consider two variations on this problem. In the first alternative, the targeted distribution is given by k real numbers @m"1,...,@m"k such that 0=0 is the number of undistinguished atoms. The structures must be generated uniformly among the set of structures of size n that contain exactlyn"i atoms Z"i (1@?i@?k). We give a O(r^2@?"i"="1^kn"i^2+mnklogn) algorithm for generating m structures, which simplifies into a O(r@?"i"="1^kn"i+mn) for regular specifications.