以编号0为根进行TreeDP即可，由于是多叉树，所以采用资源分配型DP的方式转化为泛化背包来处理比较方便，注意由于根节点实际上是不存在的，故所求答案应为f[0,m+1]。
状态转移方程是f[father[now],i]=max(f[father[now],i],f[father[now],i-j]+f[now,j])(1<=i<=m+1,1<=j<i)，初始化f[i,1]=v[i]。
R1123578 Accepted 100 From IwfWcf－ P1180 FPC Vijos Dolphin 2009-1-26 10:57:35
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