The quadtree is the two-dimensional case of a broader family of space-partitioning data structures. Octrees extend the same idea to three dimensions (splitting cubes into eight children), KD-trees use alternating axis-aligned splits (splitting along x, then y, then x again), and R-trees group nearby objects into bounding rectangles. Each variant makes different tradeoffs between construction time, query speed, and update cost.
昨天我给母亲换了一个新的手机号码，用于日常对外联系，这个号码是用我的主卡办理的副卡。而她名下所有银行卡的预留手机号，仍然绑定在那个旧的、由我来管理的手机号码。这样，任何涉及银行转账的短信验证码，都会发到我的手机上。理论上，这能实现资金的“共管”。，推荐阅读51吃瓜获取更多信息
Екатерина Графская (Редактор отдела «Наука и техника»)，更多细节参见heLLoword翻译官方下载
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