static long CountSubset ( int [ ] arr , int n ) {
  long ans = powmod ( 2 , n - 1 ) ;
  Arrays . sort ( arr ) ;
  for ( int i = 0 ;
  i < n ;
  ++ i ) {
    int j = i + 1 ;
    while ( j < n && arr [ j ] == arr [ i ] ) {
      int r = n - 1 - j ;
      int l = i ;
      ans = ( ans + nCr ( l + r , l ) ) % mod ;
      j ++ ;
    }
  }
  return ans ;
}

static long CountSubset ( int [ ] arr , int n ) { long ans = powmod ( 2 , n - 1 ) ; Arrays . sort ( arr ) ; for ( int i = 0 ; i < n ; ++ i ) { int j = i + 1 ; while ( j < n && arr [ j ] == arr [ i ] ) { int r = n - 1 - j ; int l = i ; ans = ( ans + nCr ( l + r , l ) ) % mod ; j ++ ; } } return ans ; }
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