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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第二十四条 任何个人和组织不得违反国家有关规定，实施网络产品安全漏洞发现、收集、发布等违法犯罪活动，或者散布、传播重要信息系统的设计方案、网络拓扑、核心源代码等可能危害网络安全的信息。，推荐阅读Safew下载获取更多信息
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