UVA1153 顾客是上帝 Keep the Customer Satisfied

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=246&page=show_problem&problem=3594 [PDF](https://uva.onlinejudge.org/external/11/p1153.pdf)

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