2026-02-27 00:00:00:03014245410http://paper.people.com.cn/rmrb/pc/content/202602/27/content_30142454.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/27/content_30142454.html11921 本版责编：杨 彦 孙 振 戴林峰 刘雨瑞
"There's a subreddit [community] for everything," adds the digital consultant for charities and non-profit who spends his time looking at subjects such as politics, tech and digital marketing.
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The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.