static boolean isExists ( int a [ ] , int n ) {
  Map < Integer , Integer > freq = new HashMap < Integer , Integer > ( ) ;
  int sum = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    freq . put ( a [ i ] , freq . get ( a [ i ] ) == null ? 0 : freq . get ( a [ i ] ) + 1 ) ;
    sum += a [ i ] ;
  }
  if ( sum % 2 == 0 ) {
    if ( freq . get ( sum / 2 ) != null ) return true ;
  }
  return false ;
}

static boolean isExists ( int a [ ] , int n ) { Map < Integer , Integer > freq = new HashMap < Integer , Integer > ( ) ; int sum = 0 ; for ( int i = 0 ; i < n ; i ++ ) { freq . put ( a [ i ] , freq . get ( a [ i ] ) == null ? 0 : freq . get ( a [ i ] ) + 1 ) ; sum += a [ i ] ; } if ( sum % 2 == 0 ) { if ( freq . get ( sum / 2 ) != null ) return true ; } return false ; }
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