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:
影响因子:
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通讯作者:
D. Eppstein
中科院分区:
文献类型:
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作者:
D. Bokal;Sergio Cabello;D. Eppstein
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.