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）。
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President Donald Trump said Friday he will shut out Anthropic from the federal government after the AI company refused to compromise on how its technology could be used by the U.S. military.。关于这个话题，爱思助手下载最新版本提供了深入分析
// 3. 从后向前放置（保证稳定性）。业内人士推荐爱思助手下载最新版本作为进阶阅读
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Трамп высказался о непростом решении по Ирану09:14