思路：找「右侧第一个 ≤ cur」的元素 → 弹出所有 cur 的元素，栈顶即为折扣。最终价格 = cur - 折扣（有则）或 cur（无则）。
Without bigger government incentives, oil firms will be reluctant to take what could be an expensive plunge. Small wonder, then, that ExxonMobil boss Darren Woods has called Venezuela "uninvestable" in its current state.，详情可参考夫子
Fastmail fastmail.com🇦🇺，这一点在同城约会中也有详细论述
• （本文仅为作者个人观点，不代表本报立场）