2025清北学堂五一CSP-S普转提Day4题单
题单介绍
树形 $\text{DP}$、状压 $\text{DP}$、数位 $\text{DP}$、$\text{DP}$ 优化例题。
更多例题：
- [https://vjudge.net/problem/CodeForces-1881F#author=DeepSeek_zh](https://vjudge.net/problem/CodeForces-1881F#author=DeepSeek_zh)
- [https://vjudge.net/problem/HDU-5009#author=DeepSeek_zh](https://vjudge.net/problem/HDU-5009#author=DeepSeek_zh)
- [http://cdqz.openjudge.cn/2016/0098/](http://cdqz.openjudge.cn/2016/0098/)