제출 #107101

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

2 1
1 

2 2
1 3 

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

3 3
1 3 4 

2 1
1 

6
1 5
3 5
1 2
4 5
6 1
-1 -1

3 2
1 5 

2 2
1 5