http://poj.org/problem?id=2436 //* @author: 82638882@163.com import java.io.*; public class Main { public static void main(String[] args) throws IOException { InputStreamReader is=new InputStreamReader(System.in); BufferedReader in=new BufferedReader(is); String[] ss=in.readLine().split(" "); int n=Integer.parseInt(ss[0]); int d=Integer.parseInt(ss[1]); int k=Integer.parseInt(ss[2]); int[] q=new int[n]; for(int i=0;i< n;i++) { ss=in.readLine().split(" "); int a=Integer.parseInt(ss[0]); for(int j=0;j< a;j++){ int f=Integer.parseInt(ss[j+1]); q[i]+=Math.pow(2, f-1); } } System.out.println(f(d,k,q,0,0,0)); } static int f(int d,int k,int[] q,int c,int s,int l) { if(c==k) { int ans=0; s=~s; for(int i=0;i< q.length;i++) if((s&q[i])==0)ans++; return ans; } if(l+k>d+c) return 0; int w=(int) Math.pow(2, l); return Math.max(f(d,k,q,c,s,l+1), f(d,k,q,c+1,s+w,l+1)); } }
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