 "-"

   . 
       
 ,    
   .

:
       :
-   
-     

 :
      
 : N (1 <= N <= 100) - 
  .   N   N  - 
   (j-   i-  
    i   j):  0 
 ,     - 
  .    
  100. 

 :
 N   N . j-   i-   
     i   j.
    0,    ,
1 -    ,  2 -   ,
      .

  
5
0 1 2 0 0
1 0 3 0 0
2 3 0 0 0
0 0 0 4 -1
0 0 0 -1 0 

  
1 1 1 0 0
1 1 1 0 0
1 1 1 0 0
0 0 0 2 2
0 0 0 2 2