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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.
，这一点在体育直播中也有详细论述
В России допустили «второй Чернобыль» в Иране22:31
白宮發布了四張照片，顯示特朗普總統及其內閣成員監督由美國與以色列部隊執行的對伊朗空襲行動。仔細觀察照片中的人物與背景細節，可以揭示當時房間內發生的情況。