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{ 63, 31, 55, 23, 61, 29, 53, 21 } };
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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.
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Mahjong, Sudoku, free crossword, and more: Play games on Mashable。关于这个话题，下载安装 谷歌浏览器 开启极速安全的 上网之旅。提供了深入分析
The Android platform already includes multiple security mechanisms that do not require central registration: