제출 #97891

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

YES
YES

NO
YES

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

YES
YES

YES
NO

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

YES
YES

YES
NO