// 计算天数：栈非空→栈顶索引-当前索引；栈空→0（易错点3：索引差别写反）
Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04
，更多细节参见搜狗输入法2026
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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