Preprocessing Chains for Fast Dihedral Rotations Is Hard or Even Impossible
摘要
We examine a computational geometric problem concerning the structure of polymers. We model a polymer as a polygonal chain in three dimensions. Each edge splits the polymer into two subchains, and a dihedral rotation rotates one of these chains rigidly about this edge. The problem is to determine, given a chain, an edge, and an angle of rotation, if the motion can be performed without causing the chain to self-intersect. An Omega(n log n) lower bound on the time complexity of this problem is known. We prove that preprocessing a chain of n edges and answering n dihedral rotation queries is 3SUM-hard, giving strong evidence that solving n queries requires Omega(n^2) time in the worst case. For dynamic queries, which also modify the chain if the requested dihedral rotation is feasible, we show that answering n queries is by itself 3SUM-hard, suggesting that sublinear query time is impossible after any amount of preprocessing.
引用
@article{arxiv.cs/0204042,
title = {Preprocessing Chains for Fast Dihedral Rotations Is Hard or Even Impossible},
author = {Michael Soss and Jeff Erickson and Mark Overmars},
journal= {arXiv preprint arXiv:cs/0204042},
year = {2007}
}
备注
11 pages, 9 figures, see also http://www.cs.uiuc.edu/~jeffe/pubs/dihedral.html