static int minOperations ( int n , int m , int k , int matrix [ ] [ ] ) {
  int [ ] arr = new int [ n * m ] ;
  int mod = matrix [ 0 ] [ 0 ] % k ;
  for ( int i = 0 ;
  i < n ;
  ++ i ) {
    for ( int j = 0 ;
    j < m ;
    ++ j ) {
      arr [ i * m + j ] = matrix [ i ] [ j ] ;
      if ( matrix [ i ] [ j ] % k != mod ) {
        return - 1 ;
      }
    }
  }
  Arrays . sort ( arr ) ;
  int median = arr [ ( n * m ) / 2 ] ;
  int minOperations = 0 ;
  for ( int i = 0 ;
  i < n * m ;
  ++ i ) minOperations += Math . abs ( arr [ i ] - median ) / k ;
  if ( ( n * m ) % 2 == 0 ) {
    int median2 = arr [ ( n * m ) / 2 ] ;
    int minOperations2 = 0 ;
    for ( int i = 0 ;
    i < n * m ;
    ++ i ) minOperations2 += Math . abs ( arr [ i ] - median2 ) / k ;
    minOperations = Math . min ( minOperations , minOperations2 ) ;
  }
  return minOperations ;
}

static int minOperations ( int n , int m , int k , int matrix [ ] [ ] ) { int [ ] arr = new int [ n * m ] ; int mod = matrix [ 0 ] [ 0 ] % k ; for ( int i = 0 ; i < n ; ++ i ) { for ( int j = 0 ; j < m ; ++ j ) { arr [ i * m + j ] = matrix [ i ] [ j ] ; if ( matrix [ i ] [ j ] % k != mod ) { return - 1 ; } } } Arrays . sort ( arr ) ; int median = arr [ ( n * m ) / 2 ] ; int minOperations = 0 ; for ( int i = 0 ; i < n * m ; ++ i ) minOperations += Math . abs ( arr [ i ] - median ) / k ; if ( ( n * m ) % 2 == 0 ) { int median2 = arr [ ( n * m ) / 2 ] ; int minOperations2 = 0 ; for ( int i = 0 ; i < n * m ; ++ i ) minOperations2 += Math . abs ( arr [ i ] - median2 ) / k ; minOperations = Math . min ( minOperations , minOperations2 ) ; } return minOperations ; }
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