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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.
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我在北京同仁医院的病床上度过了一段难挨的时光。那时，经过三期的化疗，身上的淋巴瘤已然全部消失，但药物的副作用也明显地显现出来：厌食、失去味觉、便秘、失眠。何况，后面还有四期、五期、六期、七期，最终可能要八期的化疗等着我。可想而知，我的心绪是何等沮丧。“掐着指头数日子”“天花板像一页读腻了的书”，这是臧克家先生住院时写下的诗句，如今的我，每天都不得不默诵几遍。。业内人士推荐heLLoword翻译官方下载作为进阶阅读
originally provided for remote job entry, the conceptual ancestor of IBM's later。业内人士推荐im钱包官方下载作为进阶阅读