This is the source code for the following two papers:
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D.W. Choi, C.W. Chung, and Y. Tao, "A Scalable Algorithm for Maximizing Range Sum in Spatial Databases," in Proceedings of the Very Large Database Endowment (PVLDB), 2012.
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D.W. Choi, C.W. Chung, and Y. Tao, "Maximizing Range Sum in External Memory," ACM Transactions on Database Systems (TODS), 2014.