제출 #153982

3
3 1
2 3
1 2

1
1

1
3

cables cross: cable at A=3 with B=1 after B<=3

4
3 4
2 3
1 1
4 2

1
2

1
4

cables cross: cable at A=4 with B=2 after B<=4

4
3 4
1 1
2 3
4 2

1
2

1
4

cables cross: cable at A=4 with B=2 after B<=4