static long computeSum ( int [ ] arr , int n ) {
  Arrays . sort ( arr ) ;
  long sum = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    long maxs = ( power ( 2 , i ) - 1 + mod ) % mod ;
    maxs = ( maxs * arr [ i ] ) % mod ;
    long mins = ( power ( 2 , n - 1 - i ) - 1 + mod ) % mod ;
    mins = ( mins * arr [ i ] ) % mod ;
    long V = ( maxs - mins + mod ) % mod ;
    sum = ( sum + V ) % mod ;
  }
  return sum ;
}

static long computeSum ( int [ ] arr , int n ) { Arrays . sort ( arr ) ; long sum = 0 ; for ( int i = 0 ; i < n ; i ++ ) { long maxs = ( power ( 2 , i ) - 1 + mod ) % mod ; maxs = ( maxs * arr [ i ] ) % mod ; long mins = ( power ( 2 , n - 1 - i ) - 1 + mod ) % mod ; mins = ( mins * arr [ i ] ) % mod ; long V = ( maxs - mins + mod ) % mod ; sum = ( sum + V ) % mod ; } return sum ; }
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