The sector was just beginning to boom amid post-World War Two economic prosperity, coupled with a growing preference among consumers for take-home drinks over soda fountains.
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.，详情可参考im钱包官方下载
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