UVA699 下落的树叶 The Falling Leaves

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=8&page=show_problem&problem=640 [PDF](https://uva.onlinejudge.org/external/6/p699.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA699/735ce6ad24a18ffc8b70b3a6c28998f5211a95ce.png)

Input Format

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Output Format

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