제출 #38465

2
2 1
1 2
4 2
2 4
4 1

NO
NO

YES
YES

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

NO
NO
NO

YES
YES
YES

3
3 1
1 2
5 2
1 3
2 1
2 1
1 2

NO
NO
NO

YES
YES
YES