Update Impracticality: The extensive pre-processing for CH makes it unsuitable for frequent updates, let alone OsmAnd’s goal of supporting near real-time changes through hourly map updates.
优势：时间复杂度O(n+k)，k为数据范围
，详情可参考同城约会
63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54
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