UVA12535 圆周上的三角形 Probability Through Experiments

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=441&page=show_problem&problem=3980 [PDF](https://uva.onlinejudge.org/external/125/p12535.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12535/0a47243bec2662c630cdaebacd1b838a2b28ce25.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12535/0f4393dcdaadfba959f8386754ce799542e567de.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12535/529db3c068a6642cb6375821258ce170b1103069.png)