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为政之道，得其大者可以兼其小。
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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.。关于这个话题，服务器推荐提供了深入分析
This creates two distinct problems: