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）。
On this day, 30 years ago, the original Pokémon games, Pokémon Red and Pokémon Green, were first released in Japan.
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Google has apologised for sending a news alert on this year's Bafta awards ceremony that suggested suggesting people read further into a racial slur.
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一个胸怀远大目标、立志于中华民族千秋伟业的政党，必然凭实绩立身致远。
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