static void subsetSum ( Vector < Integer > c ) {
  int L = c . size ( ) ;
  int mul = ( int ) Math . pow ( 2 , L - 1 ) ;
  for ( int i = 0 ;
  i < c . size ( ) ;
  i ++ ) ans += c . get ( i ) * mul ;
}

static void subsetSum ( Vector < Integer > c ) { int L = c . size ( ) ; int mul = ( int ) Math . pow ( 2 , L - 1 ) ; for ( int i = 0 ; i < c . size ( ) ; i ++ ) ans += c . get ( i ) * mul ; }
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