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.
Standard Digital
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Vomvolakis maintained there was no evidence that rocks or ice were packed into the snowballs.
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// 步骤4：扩展左边界（向左找所有minVal的元素，全程不越界）