제출 #94206

2
2 1
2 1
5 2
2 3
3 1

YES
NO
NO

YES
YES

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

YES
NO
NO

YES
YES

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

YES
NO
NO

YES
YES