* 核心思路：单调递减栈（找「上一个比当前价格大的元素索引」），时间复杂度O(n)，空间复杂度O(n)
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The new Powerbeats Fit are the direct successors to 2022’s popular Beats Fit Pro, costing £200 (€230/$200/A$330). They sit alongside the recently redesigned Powerbeats Pro 2 as Apple’s fitness alternatives of the AirPods.