摘要: In the colored (or categorical) range reporting problem set of input points is partitioned into categories and stored in a data structure; query asks for that belong to range. this paper we study two-dimensional external memory model present I/O-efficient structures problem.In particular, describe answer three-sided queries O(K/B) I/Os in(log2logB N + K/B) when lie on an x grid, K number reported colors, B block size. The space usage both close optimal.