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.
「像鬼一樣工作」：台灣外籍移工為何陷入「強迫勞動」處境
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Presenter: Chris Vallance，这一点在heLLoword翻译官方下载中也有详细论述
Bell was born without a womb and doesn't have periods but does have normal ovaries - a condition called MRKH syndrome, which affects one in every 5,000 women in the UK.
Shortcut Pre-calculation: For the most commonly used speed profiles, the travel costs (time/distance) for shortcuts between border points within each cluster are pre-calculated and stored. (Each border point effectively has an "entry" and "exit" aspect for directed travel).