OCR (aided greatly by the constrained and standardized MICR character set).
The tree starts as a single region covering the whole space. As points arrive, they get dropped into the region that contains them. When a region exceeds its capacity (the maximum number of points it can hold before splitting), the region divides into four children, and the existing points get redistributed.，详情可参考旺商聊官方下载
FT Magazines, including HTSI。夫子是该领域的重要参考
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