A new algorithm for Euclidean shortest paths in the plane
A new algorithm for Euclidean shortest paths in the plane
复制标题
平面内欧氏最短路径的新算法
DOI:
10.1145/3406325.3451037
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Wang, Haitao
中科院分区:
文献类型:
--
作者:
Wang, Haitao
Given a set of pairwise disjoint polygonal obstacles in the plane, finding an obstacle-avoiding Euclidean shortest path between two points is a classical problem in computational geometry and has been studied extensively. Previously, Hershberger and Suri (inSIAM Journal on Computing, 1999) gave an algorithm ofO(nlogn) time andO(nlogn) space, wherenis the total number of vertices of all obstacles. Recently, by modifying Hershberger and Suri’s algorithm, Wang (in SODA’21) reduced the space toO(n)while the runtime of the algorithm is stillO(nlogn). In this article, we present a new algorithm ofO(n+hlogh) time andO(n)space, provided that a triangulation of the free space is given, wherehis the number of obstacles. The algorithm is better than the previous work whenhis relatively small. Our algorithm builds a shortest path map for a source pointsso that given any query pointt, the shortest path length fromstotcan be computed inO(logn) time and a shortests-tpath can be produced in additional time linear in the number of edges of the path.
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DOI:
--
发表时间:
2018
期刊:
影响因子:
--
作者:
S. Bae;Haitao Wang
通讯作者:
Haitao Wang
影响因子:
1.1
作者:
Joseph S. B. Mitchell
通讯作者:
Joseph S. B. Mitchell
DOI:
--
发表时间:
2013
期刊:
International Symposium on Computational Geometry
影响因子:
--
作者:
J. Hershberger;S. Suri;Hakan Yildiz
通讯作者:
Hakan Yildiz
DOI:
--
发表时间:
2000
期刊:
SIAM journal on computing (Print)
影响因子:
--
作者:
S. Kapoor;S. Maheshwari
通讯作者:
S. Maheshwari
DOI:
10.1137/1.9781611976465.51
发表时间:
2021
期刊:
Proceedings of the 32nd Annual ACM-SIAM Symposium on Discrete Algorithms (SODA 2021
影响因子:
--
作者:
Wang, Haitao
通讯作者:
Wang, Haitao