給你n個集合。集合中均為數字且數字的範圍在[1,m]内。m<=14。現在問用這些集合能組成多少個集合自己本身也算。
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.StreamTokenizer;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.NavigableSet;
import java.util.PriorityQueue;
import java.util.Queue;
import java.util.Scanner;
import java.util.SortedSet;
import java.util.Stack;
import java.util.StringTokenizer;
import java.util.TreeSet;
import org.omg.CORBA.Object;
public class Main {
public static void main(String[] args) throws IOException{
StreamTokenizer cin = new StreamTokenizer(new BufferedInputStream(System.in));
InputReader in = new InputReader(System.in) ;
PrintWriter out = new PrintWriter(System.out) ;
while(cin.nextToken() != cin.TT_EOF){
int n = (int) cin.nval ;
cin.nextToken() ; int m = (int) cin.nval ;
new Task().solve(n , m , cin, out) ; //out.flush() ;
}
out.flush() ;
}
}
class Task{
boolean[] vis ;
public void solve(int n , int m , StreamTokenizer cin , PrintWriter out) throws IOException{
int limit = 1<<m ;
vis = new boolean[limit] ;
Arrays.fill(vis, false);
for(int cas = 1 ; cas <= n ; cas++){
int val = 0 ;
cin.nextToken() ; int k = (int)cin.nval ;
for(int i = 0 ; i < k ; i++){
cin.nextToken() ; int j = (int)cin.nval ;
val |= (1<< (j-1)) ;
}
vis[val] = true ;
for(int i = 0 ; i < limit ; i++){
if(vis[i]) vis[i|val] = true ;
}
}
int sum = 0 ;
for(int i = 1 ; i < limit ; i++) sum += vis[i] ? 1 : 0 ;
out.println(sum) ;
}
}
class InputReader{
public BufferedReader reader;
public StringTokenizer tokenizer;
public InputReader(InputStream stream){
reader = new BufferedReader(new InputStreamReader(stream), 32768) ;
tokenizer = null ;
}
public String next(){
while(tokenizer == null || ! tokenizer.hasMoreTokens()){
try{
tokenizer = new StringTokenizer(reader.readLine());
}catch (IOException e) {
throw new RuntimeException(e);
}
}
return tokenizer.nextToken();
}
public int nextInt() {
return Integer.parseInt(next());
}
public long nextLong() {
return Long.parseLong(next());
}
}