Finding All Maximal Subsequences with Hereditary Properties

Finding All Maximal Subsequences with Hereditary Properties
复制标题

查找所有具有遗传属性的最大子序列

DOI:
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发表时间:
2015
期刊:
International Symposium on Computational Geometry
影响因子:
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通讯作者:
D. Eppstein
D. Eppstein
中科院分区:
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文献类型:
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作者:
D. Bokal;Sergio Cabello;D. Eppstein

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考虑一个序列s_1,...,s_n在平面上。我们想要找到具有给定遗传性质P的所有最大子序列:对于所有索引i,找到最大索引j ^*(i),使得s_i,.,s_{j ^*(i)}具有性质P。我们提供了一个通用方法,导致以下具体结果: - 在O(n log^2 n)时间内,我们可以找到所有直径不超过1的最大连续性。 - 在O(n log n loglog n)时间内我们可以找到所有凸船体的面积最大为1的极大连续性。 - 在O(n)时间内,我们可以找到所有在某个方向(子路径依赖)定义单调路径的最大连续性。 同样的方法适用于图形平面性,如下所示。考虑一个边序列e_1,...,在O(n log n)时间内,我们可以找到,对于所有索引i,最大索引j ^*(i),使得(V,{e_i,.,e_{j ^*(i)}})是平面的。
Consider a sequence s_1,...,s_n of points in the plane. We want to find all maximal subsequences with a given hereditary property P: find for all indices i the largest index j^*(i) such that s_i,...,s_{j^*(i)} has property P. We provide a general methodology that leads to the following specific results: - In O(n log^2 n) time we can find all maximal subsequences with diameter at most 1. - In O(n log n loglog n) time we can find all maximal subsequences whose convex hull has area at most 1. - In O(n) time we can find all maximal subsequences that define monotone paths in some (subpath-dependent) direction. The same methodology works for graph planarity, as follows. Consider a sequence of edges e_1,...,e_n over a vertex set V. In O(n log n) time we can find, for all indices i, the largest index j^*(i) such that (V,{e_i,..., e_{j^*(i)}}) is planar.