为推动学习教育扎实开展、营造良好舆论氛围，本报今起开设“树立和践行正确政绩观”专栏，展现各地区各部门各单位开展学习教育的进展成效。
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.，更多细节参见WPS官方版本下载
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