If you reserve a type for pointers to other arrays, and you always ref it
Pretty vs. Ugly Errors
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The couple are part of a group, Truth for Our Babies, who are campaigning for an independent investigation into maternity services at the University Hospitals Sussex NHS Trust. Earlier this month, BBC News and the New Statesman found that at least 55 babies over a five-year period might have survived with better care.
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.