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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Opens in a new window，更多细节参见同城约会
computer over a single interleaved SDLC link. But what would you put on those