为政一方，以“不要立志做大官，而要立志做大事”来勉励自己；夜读《人民呼唤焦裕禄》，深情写下：“为官一任，造福一方，遂了平生意。”
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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2025年3月，在巩固拓展脱贫攻坚成果同乡村振兴有效衔接5年过渡期的最后一年，习近平总书记在贵州、云南考察时进一步强调：“脱贫的兜底必须是固若金汤的，绝对不能出现规模性返贫致贫。”
We cannot, and should not, expect users to know this.
int mid = left + (right - left) / 2; // 防止溢出的中点计算