即便愿意付正价的客人，看到身边人都在买折扣券，也会跟风选择，这就让门店陷入了“想服务正价客人、想保持合理利润却不可得”的困境。
* @param n 数组长度
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The couple met by chance when they were on separate walks along the South West Coast Path in 2011, and ended up married three years later.
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