“总书记，您平时这么忙，还来看我们，真的感谢您。”朴实的村民由衷地说。
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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u = urljoin(BASE, href)。业内人士推荐夫子作为进阶阅读