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.
《呼兰河传》中关于祖父的后花园有一段描写：“后花园”的花开了，就像花睡醒了似的。鸟飞了，就像鸟上天了似的。虫子叫了，就像虫子在说话似的。一切都活了。都有无限的本领，要做什么，就做什么。要怎么样，就怎么样。都是自由的。
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Maggie姐对菜单早已烂熟于心，不要一分钟就把菜点好了。花色繁复的刺身拼盘一上来，她夹起一枚甜虾就塞进嘴里，甚至懒得细细品味，嚼两口便咽下肚。她漫不经心，却很懂吃，挖一勺海胆到盘子里，抹点调料，接着是下一勺，干脆利落，细腻周到，正如她当妈咪的风格。，详情可参考heLLoword翻译官方下载