这些问题的答案，都越来越清晰。
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Walmart said it was improving its systems to "ensure fairness and transparency" and had already started making payments to people who had been affected.
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.