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.
数百万册书被切开、扫描、回收，最后换来一份和解协议。那些书，早已不在了。而 AI 还在继续写作，且会越来越快。这大概就是这件事最让人不安的地方：对于书被销毁，被肆意用来训练 AI 这件事，没有人真正付出了代价。。搜狗输入法2026是该领域的重要参考
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In December, the UK, Norway, the Faroe Islands and Iceland agreed to cut mackerel catches by 48%, but Waitrose said this did not go far enough.
不过在中低端市场面临缩减的同时，高端市场的成长韧性进一步凸显，反而有望扩大。IDC的预测中，中国智能手机市场600美元以上市场份额将达到35.9%，同比增长5.4个百分点。