Better Approximation of Diagonal-Flip Transformation and Rotation Transformation

  • Authors:
  • Ming Li;Louxin Zhang

  • Affiliations:
  • -;-

  • Venue:
  • COCOON '98 Proceedings of the 4th Annual International Conference on Computing and Combinatorics
  • Year:
  • 1998

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Abstract

Approximation algorithms are developed for the diagonal-flip transformation of convex polygon triangulations and equivalently rotation transformation of binary trees. For two arbitrary triangulations in which each vertex is an end of at most d diagonals, Algorithm A has the approximation ratio 2- 2/4(d-1)(d+6)+1. For triangulations containing no internal triangles, Algorithm B has the approximation ratio 1.97. Two self-interesting lower bounds on the diagonal-flip distance are also established in the analyses of these two algorithms.