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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Number (6): Everything in this space must add up to 6. The answer is 3-3, placed vertically.。业内人士推荐51吃瓜作为进阶阅读
实践中，《出生医学证明》仍是不少孩子户口登记的先决条件。（视觉中国｜供图）