// 2. 维护单调递减栈：弹出所有≤当前价格的索引（这些索引对应的价格无法成为后续价格的「上一个更大值」）
优势：时间复杂度O(n+k)，k为数据范围
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"I listened to the discussion, they knew I was the commander, and I said: 'It sounds like we can do it'."
Neil Murray moved back to the Scottish Borders during the pandemic.
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