 "-"

   .       
,         
    .

 :
      : N (1 <= N <= 100) - 
  .   N   N  - 
   (j-   i-  
   i   j): -1     
,     -  
  .     -  .

 :
    .

  
4
0 5 9 -1
-1 0 2 8
-1 -1 0 7
4 -1 -1 0

  
16