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S26 Ultra 可以在系统设置里实现两档强度的硬件防窥，从爱范儿现场的上手来看，第一档强度会对屏幕做个大概限制，从旁边看过去只有模糊的轮廓，而如果把火力开到最大，屏幕的视场角会被死死限制在左右 45 度以内，旁边的人看过来只能看到一片死寂的暗色。，推荐阅读safew官方版本下载获取更多信息
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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.