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.
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At one extreme: if you’re making a prototype or quick script, I reckon all errors are unexpected. You might decide not to handle problems with the network, filesystem, or user input. Who cares? This is just a little script or idea.。业内人士推荐旺商聊官方下载作为进阶阅读
Instead, it's in the runtime. This "inversion of control"。关于这个话题，搜狗输入法下载提供了深入分析