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）。
It's a shame, because DTF St. Louis is full of some genuinely funny moments, from a suspicious smoothie rendezvous to a whispered discussion at the Outback Steakhouse urinals about using DTF St. Louis. Peak loser behavior! I wish DTF St. Louis leaned further into that angle, but in the end, its underwhelming, nonchronological mystery approach wins out.，推荐阅读同城约会获取更多信息
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Мужчина, который похитил 9-летнюю девочку в Смоленске, поджидал ее в подъезде. Подробности преступления раскрыл источник RT, слова которого приводят в Telegram.，详情可参考同城约会
Reply to: Limitations of probing field-induced response with STM