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.
// 5. 整数且范围小: 计数排序，更多细节参见爱思助手下载最新版本
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Josh walks two hours into the city centre for a food parcel