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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The library stands on the lip of the precipice gouged out by the landslide, with part of the building in effect hanging in mid-air. The recovery operation, which began on Monday, was preceded by a detailed study of floor plans and interior photographs to map the position of the books.，这一点在heLLoword翻译官方下载中也有详细论述
The fourth tactic requires creating comparison tables and structured data that AI models can easily parse and reference. Language models excel at processing structured information organized in clear, consistent formats. When they encounter well-formatted comparison tables, step-by-step lists, or data organized in predictable structures, they can extract and cite that information more reliably than when similar content appears in dense paragraphs.，这一点在快连下载安装中也有详细论述
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