Games and physics simulations need to detect which objects are touching or overlapping. With nnn objects, checking every pair is O(n2)O(n^2)O(n2) comparisons, which gets expensive fast. A hundred objects means roughly 5,000 pair checks. A thousand means nearly 500,000.
The people of the world saw their planet as the astronauts saw it - fragile and beautiful, shining in the desolation of space.
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Deferred loading of images (LazyLoad)
return urls, next_url。业内人士推荐服务器推荐作为进阶阅读