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）。
Dr Greg Leo, an economist at Vanderbilt University in Nashville, Tennessee, has come up with a compatibility algorithm. It finds that not only might you have a "One" you have lots of "Ones".
。下载安装 谷歌浏览器 开启极速安全的 上网之旅。是该领域的重要参考
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СюжетЗавершение конфликта на Украине