UVA10640 飞机环球 Planes around the World

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=18&page=show_problem&problem=1581 [PDF](https://uva.onlinejudge.org/external/106/p10640.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10640/e6039ea048a198558d7dfa489be596425bc9bda8.png)

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