Very Fast Algorithms for the Area of the Union of Many Circles
Very Fast Algorithms for the Area of the Union of Many Circles
Paul G Spirakis
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■ r. L- --. '-^ . :. ! -7- 2. 3. 2. The straightforward approach Let us assume that we can find (in time a(n)) a closed curve A (enclosing area E(A)), which completely encloses the n circles. Assume also that we have a fast way (of time T(n) per point selection) of selecting points within A (or the interior of A) in a uniformly random manner (meaning that the probability of a point selected to fall Into an elementary area, Ae, around a specific point Pq, is the same VP^ (A plus interior (A)) an...d it is equal to • Ae. ) E(A) Finally, let 3(n) be the time it takes to decide if a given (arbitrarily selected) point P belongs to the union of the n circles. Straightforward MC 1 E( A) (I) We select N > [ - ij points, uniformly randomly. (Note that, to do this selection we don't need to know U, just an upper bound on E(A)/U is sufficient). (II) For each point selected in (I), we test if it belongs to the union of circles. Let M
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