The quadtree is the two-dimensional case of a broader family of space-partitioning data structures. Octrees extend the same idea to three dimensions (splitting cubes into eight children), KD-trees use alternating axis-aligned splits (splitting along x, then y, then x again), and R-trees group nearby objects into bounding rectangles. Each variant makes different tradeoffs between construction time, query speed, and update cost.
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。WPS官方版本下载是该领域的重要参考
At first glance, one might mistake Andrew's custom-built desk for upscale gym equipment
量产激励飞傲及少数派评审团队将在活动结束后，综合外观设计、材料工艺、量产难度等因素，选择一批设计稿投入量产并销售。（量产名单独立于获奖名单确定，两者并无必然关联。）