제출 #96782

2
5 1
2 1
7 2
7 1
2 7

YES
NO

YES
YES

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

YES
NO

YES
YES

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

YES
NO

YES
YES