For horizontal movement we can do even better. If your snake is moving to the right, we start by deleting every character on the left edge of the screen and inserting a new one on the right edge. After that, we do our patching (if needed). This automatically moves fruit into the correct position without us even needing to reprint it!
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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Credit: The Pokémon Company
台灣一間人力仲介、美家人力仲介公司總經理許家畯向BBC中文表示，移工所需的文件與機票費用「應該在5萬元以內就能完成」，高額收費往往是「台灣仲介與當地仲介的分潤」。他坦言，海外仲介費用多在母國收取，台灣政府雖有規範，但查證困難，除非業者自律，否則難以有效管控。
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