摘要：
[树形DP](https://cn.vjudge.net/contest/123963#overview) #include<cstdio> #include<string> #include<cstdlib> #include<cmath> #include<iostream> #include< 阅读全文
摘要：
You, the leader of Starship Troopers, are sent to destroy a base of the bugs. The base is built underground. It is actually a huge cavern, which consi 阅读全文