// 1. 统计每个元素出现次数
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与此同时，信息本身也在不断贬值。2025年5月，Graphite研究团队发现，互联网上已有超过一半的内容，是由AI生成的。AI可以基于现有信息进行无限的重组和分发，使信息密度迅速上升，但它却很难提升信息的质量，反而令传播环境变得嘈杂——人们的注意力被更多消耗，也需要更多判断力来防止被虚假和垃圾信息淹没。。业内人士推荐51吃瓜作为进阶阅读
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.