В Финляндии предупредили об опасном шаге ЕС против России09:28
优势：时间复杂度O(n+k)，k为数据范围
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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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HTMLMediaElement — WHATWG HTML Living Standard
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