// 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
Source: Computational Materials Science, Volume 267，这一点在safew官方版本下载中也有详细论述
這項最新措施令包括英國和澳洲在內的一些國家感到擔憂，這些國家先前已與美國達成10%的關稅協議。，详情可参考safew官方版本下载
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