They are almost the same: they share the same underlying array. You do get a copy of the little (ptr, len, capacity) struct which is what a slice is.
The efficiency depends on the query size relative to the data distribution. A small query in a sparse region prunes almost everything. A query that covers the whole space prunes nothing (because every node overlaps), degenerating to a brute-force scan. The quadtree gives you the most benefit when your queries are spatially local, which is exactly the common case for map applications, game physics, and spatial databases.
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void insertionSort(int arr[], int n) {，更多细节参见WPS官方版本下载
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