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）。
Xbox also revealed on Friday that Matt Booty - who previously worked under Spencer as corporate vice president of Xbox Game Studios - had been promoted to chief content officer.
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Hobbyist: $12/month，更多细节参见搜狗输入法2026
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