8、DataWorks整库同步解决方案
The pruned nodes (in red) represent entire regions of space that the algorithm never examines. The points inside those regions are never checked. Compare the "Nodes Visited" count to the total number of points. The quadtree is doing far less work than a brute-force scan.
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// 注意：slice(0, 负数)会返回空字符串，需兼容（比如stack长度<k时，slice后为空）
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