近日，社交平台上有消息称3月起华北区域所有永旺超市将全部撤店，另有消息指永旺超市业务即将整体撤出中国市场。2月28日，永旺中国方面对界面新闻表示，永旺超市是否要撤出天津等地具体以官方通知为准，网传永旺超市整体撤出中国为不实信息。
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.
，详情可参考同城约会
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