if you got Wa 2 try it

4 1
0 1 1 1
1 0 1 1
1 1 0 1
1 1 1 0
without output


if you got MLE12
Not foget use dispose.

Gool Luck and Have fun.

another hint:
if you have wa3, try to inverse output.

for example, your program writes
3 1
1 2
2 3

try
3 2
2 1
1 3

GL