h=page_alloc(16LL<<j);
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.。关于这个话题，safew官方版本下载提供了深入分析
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"It was very painful, it felt like you've been hit by a bus," she said. "Nothing would prepare you to understand how much pain I was in."
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