The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.
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It also recommended no screening for men with a family history of the disease, for the same reason - too many cancers would be overdiagnosed and overtreated.。搜狗输入法下载是该领域的重要参考
▲APPSO 自定义的专家，现在可以自主完成一份快讯早报