Luogu2986 [USACO10MAR]伟大的奶牛聚集 （树形DP）
有点权的重心，拆掉点dfs不就是了吗 //include <iostream> include <cstdio> include <cstring> //include <algorithm> //include <cmath> define R(a,b,c) ......![]()
【luoguP2989】[USACO10MAR]对速度的需要Need For Speed
题目描述 最大化平均值 二分一个\(x\) \(check\): \(\frac{F+\sum_{i=1}^{n} X_{i} \times F_{i}}{M+\sum_{i=1}^{n} X_{i} \times M_{i}}\geq x\) \(F+\sum_{i=1 ......【题解】Luogu p2986 [USACO10MAR]伟大的奶牛聚集Great Cow Gat 树型dp
Bessie is planning the annual Great Cow Gathering for cows all across the country and, of course, she would like to choose the most convenient locatio ......P2986 [USACO10MAR]伟大的奶牛聚集（思维，dp）
Bessie is planning the annual Great Cow Gathering for cows all across the country and, of course, she would like to choose the most convenient locatio ......树形DP + 换根DP
P1352 没有上司的舞会 设 \(f[i][0/1]\) 表示第 \(i\) 个人不去或者去。 如果第 \(i\) 个人没去，那么下属可去可不去，所以 \(f[i][0] = \sum max\{f[j][0],f[j][1] ......![]()
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