UVA12345 Dynamic len(set(a[L:R]))

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=278&page=show_problem&problem=3767 [PDF](https://uva.onlinejudge.org/external/123/p12345.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12345/d6453828213a88840fb43145e72f3ed45e014968.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12345/cc14deb9313959a7724c1eec937af11c2329f9b5.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12345/0856d4192d18df48eccca8520b50eb231fdb5666.png)