Meta said that it had filed lawsuits against several people in Brazil who promoted fake or unapproved healthcare products and online courses promoting them. The company also sued a China-based entity it says used ads featuring celebrities "as part of a larger fraud scheme that lured people into joining so-called investment groups." The company didn't provide details on how many ads these groups had run on Facebook, how many social media users had seen or interacted with the ads or how long the scammers had been operating on the platform.
Quadtree-based image compression formats and level-of-detail systems all work this way. Satellite imagery, terrain rendering, and geographic information systems use quadtree decomposition to serve data at varying resolutions: zoomed out, you see large coarse blocks; zoomed in, you see fine-grained tiles. The same principle extends to three dimensions (octrees) for volume rendering and 3D spatial indexing.，这一点在搜狗输入法下载中也有详细论述
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siftDown(arr, i, 0); // 对剩余i个元素重新建堆