for( i = 0 ; i < n ; ++i )
   for( j = 0 ; j < m ; ++j )
       if( a[i][j] != 0 )
            row[j]=col[i]=1;


for( i = 0 ; i < n ; ++i )
   for( j = 0 ; j < m ; ++j )

       {
           if (row[j]==1 || col[i]==1)
                 a[i][j]=1;
       }



Does this work?

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