> 
> import java.util.*;
> 
> public class Main {
>     public static void main(String[] args) {
>        int[][] rec = new int[10001][32];
>        int[] xor = new int[32];
>        xor[0] = 1;
>        for(int i = 1; i < 31; ++i)
>            xor[i] = xor[i - 1] * 2;
>        xor[31] = 0x80000000;
>        int n, q, ii, jj, num, temp;
>        Scanner scan = new Scanner(System.in);
>        n = scan.nextInt();
>        for(int i = 1; i <= n; ++i) {
>            num = scan.nextInt();
>            int tempx = i / 32;
>            int left = i % 32;
> 
>            if(left == 0) {
>                tempx = tempx - 1;
>                left = 32;
>            }
>            int temps = xor[left - 1];
>            
>            for(int j = 0; j < num; ++j) {
>                temp = scan.nextInt();
>                rec[temp][tempx] = (rec[temp][tempx] | temps);
>            }
>        }
>        q = scan.nextInt();
>        int max = (n + 31) / 32;
>        for(int i = 0; i < q; ++i) {
>            ii = scan.nextInt();
>            jj = scan.nextInt();
>            boolean flag = false;
>            for(int j = 0; j < max; ++j) {
>                 if((rec[ii][j] & rec[jj][j]) != 0) {
>                     flag = true;
>                     break;
>                 }
>            }
>            if(flag)
>                System.out.println("Yes");
>            else
>                System.out.println("No");
>        }
>     }
> }