4846: P3068 [USACO13JAN] Party Invitations S
Memory Limit：128 MB
Time Limit：1.000 S
Judge Style：Text Compare
Creator：
Submit：0
Solved：0
Description
Input
Output
Sample Input Copy
10 4
2 1 3
2 3 4
6 1 2 3 4 6 7
4 4 3 2 1 Sample Output Copy
4 HINT
