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）。
4.6 1475. 商品折扣后的最终价格
，这一点在safew官方版本下载中也有详细论述
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Number (3): Everything in this light blue space must add up to 3. The answer is 1-2, placed vertically.
Your Chrome extensions should install on Android, but there’s no guarantee all of them will work. Because Google Chrome Extensions are not optimized for Android devices.