public static int calculateEnergy ( int mat [ ] [ ] , int n ) {
  int i_des , j_des , q ;
  int tot_energy = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      q = mat [ i ] [ j ] / n ;
      i_des = q ;
      j_des = mat [ i ] [ j ] - ( n * q ) ;
      tot_energy += Math . abs ( i_des - i ) + Math . abs ( j_des - j ) ;
    }
  }
  return tot_energy ;
}

public static int calculateEnergy ( int mat [ ] [ ] , int n ) { int i_des , j_des , q ; int tot_energy = 0 ; for ( int i = 0 ; i < n ; i ++ ) { for ( int j = 0 ; j < n ; j ++ ) { q = mat [ i ] [ j ] / n ; i_des = q ; j_des = mat [ i ] [ j ] - ( n * q ) ; tot_energy += Math . abs ( i_des - i ) + Math . abs ( j_des - j ) ; } } return tot_energy ; }
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