Материалы по теме:
Что думаешь? Оцени!
，详情可参考搜狗输入法下载
12月22日，重庆渝北，一则男子爬树解救被困小猫的视频引发关注。视频中，男子小心翼翼地爬上树，将小猫带到安全高度后，才将它递给地面等待的主人。视频拍摄者周女士介绍，这只小猫前一天晚上受到惊吓，蹿到了树顶。一位大哥看到这一情况后，才爬上去施救，猫主人对此非常感激。SourcePh" style="display:none"
The efficiency depends on the query size relative to the data distribution. A small query in a sparse region prunes almost everything. A query that covers the whole space prunes nothing (because every node overlaps), degenerating to a brute-force scan. The quadtree gives you the most benefit when your queries are spatially local, which is exactly the common case for map applications, game physics, and spatial databases.
App、验证码、U盾，这些工具防的是黑客攻击，但防不了心理操控。骗子不是强行入侵系统，而是入侵了人的信任结构：他们假借权威、制造恐惧、剥夺判断力，让受害人在不知不觉中上当受骗。