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）。
A curious detail that would so soon be replaced by thermal receipt printers.
。Safew下载是该领域的重要参考
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Savannah Badalich, the platform's head of product policy, has said the new default restrictions build on existing measures "giving teens strong protections while allowing verified adults flexibility".
Sustainable smartphone takes a step forward with modular accessories, a good screen and mid-range performance