The grid lines on the visualization represent a tree structure underneath. Every region is a node. When a node splits, it creates four children. The root node covers the entire space. Leaf nodes (nodes with no children) hold the actual points.
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，这一点在夫子中也有详细论述
Notice how the highlighted region shrinks at each step. The algorithm never examines points outside the narrowing window. In a balanced tree with nnn points, this takes about log4(n)\log_4(n)log4(n) steps. For a million points, that's roughly 10 steps instead of a million comparisons.
We have no way to skip over points that are obviously too far away. What if we could organize the space itself so that when we search, we can immediately rule out entire regions?，推荐阅读一键获取谷歌浏览器下载获取更多信息
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