제출 #144785

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

YES
YES

YES
NO

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

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