最直接的路径，是广告化。与提高明面抽佣不同，广告化并不改变交易费率，而是将货币化重心转移到曝光、排序与推荐之上。商户为被看到的概率付费，而非为成交本身付费。从商业本质看，这是将抽佣从交易端移至流量端。
* 时间复杂度: O(n²) 最好: O(n) 空间复杂度: O(1) 稳定: ✓
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For one thing, there's the Tatum of it all. This franchise demands Sidney subtly mourn her losses, because to wallow in them would ruin the cat-and-mouse fun, right? In Scream, Sidney was given space to express the pain of losing her mother in a scene with Billy, recreated in Scream 2 and then mocked in Scary Movie.
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.