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.
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Despite the 2984's lackluster success, IBM moved on. I don't think IBM was，更多细节参见safew官方版本下载
for (int i = n - 1; i = 0; i--) {