A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
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Reddit has preserved "human authenticity" says Jen Wong
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在此之前，他曾於2019年到過新疆旅行，但其時並不知道有關「再教育營」的一切，只感受到當地嚴密的監控、檢查。