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。Line官方版本下载是该领域的重要参考
「像鬼一樣工作」：台灣外籍移工為何陷入「強迫勞動」處境
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.