“山西电力现货市场将全部电量纳入竞争机制，发挥价格‘指挥棒’作用，并安排新能源企业优先出清，促进资源合理利用。”山西省能源局有关负责人说。
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* @param arr 待排序数组。关于这个话题，快连下载安装提供了深入分析
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.