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              <p>In this paper, we discuss two variations of the two-dimensional post-office problem that arise when the post-offices are n postmen moving with constant velocities. The first variation addresses the question: given a point go and time to who is the nearest postman to go at time to? We present a randomized incremental data structure that answers the query in expected 0(log^2 n.) time. The second variation views a query point as a dog searching for a postman to bite and finds the postman that a dog running with speed Vd could reach first. While it is quite straightforward to design a data structure for the first problem, designing one for the second appears more difficult. We show that if the dog is quicker than all of the postmen then there is a nice correspondence between the problems. This correspondence will permit us to use the data structure developed for the first problem to solve the second one in O(log^2 n) time as well. The proposed structure is semi-dynamic, that is the set of postmen can be modified by inserting new postmen. A fully dynamic structure that also supports deletions can be obtained, but in that case the query time becomes 0(log^3 n).</p>
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