Most adults do not need a hard eight hours of sleep; a growing body of evidence and evolutionary research suggest the optimal nightly sleep for many healthy adults is closer to seven hours, with health risks rising on either side of that range in a U‑shaped pattern.
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// 1. 将当日价格存入数组，记录当前索引（i是当前价格在arr中的位置）。服务器推荐是该领域的重要参考