제출 #125086

2
3 2
1 3
1 2
9 6
5 6
5 4
5 3
2 5
1 5
5 7

YES
NO

YES
YES

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

YES
NO
YES

YES
YES
YES

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

YES
NO

YES
YES