제출 #97652

2
6 2
1 4
2 4
5 1
1 2

1

YES
YES

2
9 3
1 2
1 3
1 4
3 1
3 1

1

YES
YES

3
2 1
2 1
2 1
1 2
2 1
1 2

1

YES
YES
YES