// 题目要求找「右侧第一个 ≤ cur」的元素 → 弹出所有 cur 的，栈顶即为折扣
Hand optimization can still be beneficial, especially if you have a
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But a robot vacuum is the only kind of device that regularly roves around your home. That gives this vulnerability a unique sense of foreboding, perhaps enough to provide the plot to a found footage horror film.