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The grid lines on the visualization represent a tree structure underneath. Every region is a node. When a node splits, it creates four children. The root node covers the entire space. Leaf nodes (nodes with no children) hold the actual points.
，这一点在Line官方版本下载中也有详细论述
Цены на нефть взлетели до максимума за полгода17:55
每轮从未排序部分找到最小元素，放到已排序部分末尾