Dynamic Convex Hulls under Window-Sliding Updates
Dynamic Convex Hulls under Window-Sliding Updates
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DOI:
10.48550/arxiv.2305.08055
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发表时间:
2023-05
期刊:
影响因子:
--
通讯作者:
Haitao Wang
中科院分区:
文献类型:
--
作者:
Haitao Wang
We consider the problem of dynamically maintaining the convex hull of a set $S$ of points in the plane under the following special sequence of insertions and deletions (called {\em window-sliding updates}): insert a point to the right of all points of $S$ and delete the leftmost point of $S$. We propose an $O(|S|)$-space data structure that can handle each update in $O(1)$ amortized time, such that standard binary-search-based queries on the convex hull of $S$ can be answered in $O(\log h)$ time, where $h$ is the number of vertices of the convex hull of $S$, and the convex hull itself can be output in $O(h)$ time.