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.
在正定工作时，习近平同志在县委工作会议上就明确提出要求，“领导作风和工作作风要有一个突破性的变化”“一定要树立求实精神，抓实事，求实效，真刀真枪干一场”。
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const origSet = srcDesc.set;