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arXiv · 1112.5904

Memory-Constrained Algorithms for Simple Polygons

Tetsuo Asano·Kevin Buchin·Maike Buchin·Matias Korman·Wolfgang Mulzer·Günter Rote·André Schulz
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Abstract

A constant-workspace algorithm has read-only access to an input array and may use only O(1) additional words of $O(\log n)$ bits, where $n$ is the size of the input. We assume that a simple $n$-gon is given by the ordered sequence of its vertices. We show that we can find a triangulation of a plane straight-line graph in $O(n^2)$ time. We also consider preprocessing a simple polygon for shortest path queries when the space constraint is relaxed to allow $s$ words of working space. After a preprocessing of $O(n^2)$ time, we are able to solve shortest path queries between any two points inside the polygon in $O(n^2/s)$ time.

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Tetsuo Asano, Kevin Buchin, Maike Buchin, Matias Korman, Wolfgang Mulzer, Günter Rote, André Schulz. 2012-06-29. Memory-Constrained Algorithms for Simple Polygons. https://doi.org/10.1016/j.comgeo.2013.04.005

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