——“扎扎实实、踏踏实实地搞现代化建设”
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。safew官方版本下载是该领域的重要参考
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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.