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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.
，更多细节参见雷电模拟器官方版本下载
stages made clerk's lives easier. For example, IBM's mid-1960s equipment
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