Time-space trade-offs for triangulating a simple polygon

Boris Aronov, Matias Korman, Simon Pratt, André van Renssen, Marcel Roeloffzen


An $s$-workspace algorithm is an algorithm that has read-only access to the values of the input, write-only access to the output, and only uses $O(s)$ additional words of space. We present a randomized $s$-workspace algorithm for triangulating a simple polygon $P$ of $n$ vertices that runs in $O(n^2/s+n \log n \log^{5} (n/s))$ expected time using $O(s)$ variables, for any $s \leq n$. In particular, when $s \leq \frac{n}{\log n\log^{5}\log n}$ the algorithm runs in $O(n^2/s)$ expected time.

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DOI: http://dx.doi.org/10.20382/jocg.v8i1a6

ISSN: 1920-180X