In colored range counting (CRC), the input is a set of points where each point is assigned a “color” (or a “category”) and the goal is to store them in a data structure such that the number of distinct categories inside a given query range can be counted efficiently. CRC has strong motivations as it allows data structure to deal with categorical data.

中文翻译：

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彩色搜索中的分层类别

在颜色范围计数（CRC）中，输入是一组点，其中每个点都被分配一个“颜色”（或“类别”），目标是将它们存储在数据结构中，以便内部不同类别的数量可以有效地统计给定的查询范围。CRC 具有很强的动机，因为它允许数据结构处理分类数据。