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）。
По решению суда доступ к данной версии композиции на сетевых ресурсах будет ограничен.
Сайт Роскомнадзора атаковали18:00。关于这个话题，heLLoword翻译官方下载提供了深入分析
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Firefighters in Sicily have rescued about 400 rare books from a library in Niscemi that hangs on the edge of a mudflow, after a devastating landslide in January tore away an entire slope of the town and carved a 4km chasm.