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）。
The 386's protection architecture is a study in engineering tradeoffs on a tight transistor budget. The designers put dedicated hardware where it paid off most:，详情可参考下载安装 谷歌浏览器 开启极速安全的 上网之旅。
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