제출 #114355

3
7 1
4 1
3 3
1 2
2 3
1 3
2 1
2 1

YES
YES
YES

YES
NO
YES

2
2 1
1 2
5 6
4 2
2 1
1 4
3 1
3 2
1 5

YES
YES

YES
NO

2
6 5
1 2
3 4
4 5
5 6
6 3
3 3
1 2
2 3
3 1

YES
YES

YES
NO