A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
Even with the ability to take excellent photos with our phones and instantly share them across the world, there’s something magical about the old-school instant camera. With just a click of a button, you can capture a moment in a photo that you can see and touch almost immediately. Images captured by an instant camera aren’t as pristine or perfect as those produced by modern digital cameras, but their soft images and imperfections are often a big part of the allure.
，这一点在51吃瓜中也有详细论述
// ⚠️ 易错点1：长度≤1的数组本身有序，返回0而非n
And by "this," I'm also referring to Harry wearing fake elf ears, a crown and an embroidered cape.
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