delete pics to save space

p.CH5402.cpp

@@ -0,0 +1,36 @@
+#include<cstdio>
+#include<vector>
+#include<algorithm>
+#include<vector>
+using namespace std;
+const int maxn=305;
+int n,m,cnt,id[maxn],v[maxn],w[maxn],sz[maxn],f[maxn][maxn];
+vector<int> G[maxn];
+void dfs(int u)
+{
+	sz[u]=1;
+	for(int i=0;i<G[u].size();i++) { dfs(G[u][i]); sz[u]+=sz[G[u][i]]; }
+	id[++cnt]=u;
+}
+int main()
+{
+#ifdef local
+    freopen("pro.in","r",stdin);
+#endif
+    scanf("%d%d",&n,&m);
+	for(int i=1;i<=n;i++)
+	{
+		int f; scanf("%d%d",&f,&v[i]);
+		G[f].push_back(i); w[i]=1;
+	}
+	dfs(0);
+	for(int i=1;i<=cnt;i++)
+	{
+		int now=id[i];
+		for(int j=m;j>=0;j--)
+			if(j>=w[now]) f[i][j]=max(f[i-sz[now]][j],f[i-1][j-w[now]]+v[now]);
+			else f[i][j]=f[i-sz[now]][j];
+	}
+	printf("%d\n",f[cnt][m]);
+    return 0;
+}