实际题目往往需要先做一步转化（如循环数组、链表转数组、先排序再栈），再套上面模板即可。
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。同城约会是该领域的重要参考
團隊不僅要面對極端寒冷，南極的夏季也伴隨著極晝，最後還會出現持續長達數週的一次日落。，推荐阅读夫子获取更多信息
英伟达黄仁勋：年内将寻机进行资本运作。91视频对此有专业解读
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.