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.
Now that we can build the tree, let's use it to search. Finding a specific point means starting at the root and asking: which child quadrant contains this coordinate? Then you recurse into that child and ask again. Each level of the tree cuts the search space by roughly three-quarters.
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Is a Wi-Fi extender better than a mesh router?
事件发酵后，网友们的评论画风各异：有人调侃“赶紧删除这条帖子，两周内别告诉任何人”；有人脑补“卖家发现犯错时的崩溃表情”；
Step 2: Route on the Abstract Graph (The "Highway" Part):