The maximum exposure problem

The maximum exposure problem
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最大曝光问题

DOI:
10.1016/j.comgeo.2022.101861
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发表时间:
2022
期刊:
Computational Geometry
影响因子:
--
通讯作者:
Suri, Subhash
Suri, Subhash
中科院分区:
--
文献类型:
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作者:
Kumar, Neeraj;Sintos, Stavros;Suri, Subhash

文献摘要

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给定平面上的一组点 P 和轴对齐的矩形 R,如果点 p∈ P 位于 R 中所有矩形之外,则该点称为暴露。在最大曝光问题中,给定整数参数 k,我们希望从 R 中删除 k 个矩形,以便最大化暴露点的数量。我们证明这个问题是 NP 困难的,并且即使 R 中的矩形是两个固定矩形的平移,假设合理的复杂性猜想也很难近似。然而,如果 R 仅由单个矩形的平移组成,我们提出多项式时间近似方案。对于一般矩形定义的范围空间,我们提出了一种简单的O(k)双标准逼近算法;也就是说,通过删除 O (k 2) 个矩形,我们可以暴露至少 Ω (1/k) 的最佳点数。
Given a set of points P and axis-aligned rectangles R in the plane, a point p∈ P is called exposed if it lies outside all rectangles in R. In the max-exposure problem, given an integer parameter k, we want to delete k rectangles from R so as to maximize the number of exposed points. We show that the problem is NP-hard and assuming plausible complexity conjectures is also hard to approximate even when rectangles in R are translates of two fixed rectangles. However, if R only consists of translates of a single rectangle, we present a polynomial-time approximation scheme. For range space defined by general rectangles, we present a simple O (k) bicriteria approximation algorithm; that is by deleting O (k 2) rectangles, we can expose at least Ω (1/k) of the optimal number of points.