C G ] 2 0 Se p 20 18 L 1 Shortest Path Queries in Simple Polygons
C G ] 2 0 Se p 20 18 L 1 Shortest Path Queries in Simple Polygons
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C G ] 2 0 Sep 20 18 L 1 简单多边形中的最短路径查询
DOI:
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发表时间:
2018
期刊:
影响因子:
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通讯作者:
Haitao Wang
中科院分区:
文献类型:
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作者:
S. Bae;Haitao Wang
Let P be a simple polygon of n vertices. We consider two-point L1 shortest path queries in P . We build a data structure of O(n) size in O(n) time such that given any two query points s and t, the length of an L1 shortest path from s to t in P can be computed in O(log n) time, or in O(1) time if both s and t are vertices of P , and an actual shortest path can be output in additional linear time in the number of edges of the path. To achieve the result, we propose a mountain decomposition of simple polygons, which may be interesting in its own right. Most importantly, our approach is much simpler than the previous work on this problem.