输入：nums = [2,6,4,8,10,9,15]
优化：如果某轮没有发生交换，说明已有序，提前结束
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Hospitals have about two weeks supply of bone cement in stock.
And the CEO isn’t all talk—he’s actually taking action when employees raise concerns or give valuable feedback. One DM from a young staffer even changed how he runs the business.