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）。
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，更多细节参见51吃瓜
Airbnb didn’t buy houses. Uber didn’t buy cars. You just need to connect supply with demand. Build the platform, not the product, and scale without the cost.
Another event is solemnly referred to as “The Great Self-Decapitation.” Sultan of Rum explained that around 2015, some of the older guard—developers and administrators alike—left the project all at once. The exodus was due to the second scrapping of a large city in development.
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