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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，这一点在搜狗输入法下载中也有详细论述
Only one team in the history of European club competitions have lost the first leg of a tie by a three-goal margin at home and advanced in the second. Up in the directors’ box, Evangelos Marinakis, more than an interested party on that occasion, presumably had flashbacks of Olympiakos suffering a 4-1 home defeat by Maccabi Tel Aviv in the Conference League two years ago, only to triumph 6-1 in Serbia in the second leg.
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