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.
tone: “gray-scale”
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2. 按步长分组，对每组进行插入排序
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When she asked people what made them feel appreciated, it wasn't sunset proposals or surprise trips to Paris.
The bat loft at St Margaret's sits above the vestry，这一点在Line官方版本下载中也有详细论述