Though the problem is very easy to solve, some tests can help, yeah? :)

3
3 0 0
0 2 0

3 2 1

//

3
0 0 0
0 0 0

1 2 3

//

3
1 2 3
2 3 1

1 2 3

//

3
0 1 2
1 2 3

1 2 3

//

4
1 2 3 0
0 2 4 0

1 2 3 4

//

5
2 1 0 0 4
0 3 2 0 0

2 3 1 5 4

Thanks. I find more Bugs but I have WA#12. Help me!