public static void main ( String [ ] args ) {
  Scanner scan = new Scanner ( System . in ) ;
  int t = scan . nextInt ( ) ;
  for ( int tt = 0 ;
  tt < t ;
  tt ++ ) {
    int x = scan . nextInt ( ) ;
    ArrayList < Integer > nums = new ArrayList < Integer > ( ) ;
    for ( int i = 0 ;
    i < x ;
    i ++ ) {
      int temp = scan . nextInt ( ) ;
      nums . add ( temp ) ;
    }
    if ( nums . size ( ) == 1 ) {
      System . out . println ( "YES" ) ;
      continue ;
    }
    Collections . sort ( nums ) ;
    for ( int i = 0 ;
    i < nums . size ( ) - 1 ;
    i ++ ) {
      if ( nums . get ( i + 1 ) - nums . get ( i ) <= 1 ) {
        nums . remove ( i ) ;
        i -- ;
      }
    }
    System . out . println ( nums . size ( ) == 1 ? "YES" : "NO" ) ;
  }
}

public static void main ( String [ ] args ) { Scanner scan = new Scanner ( System . in ) ; int t = scan . nextInt ( ) ; for ( int tt = 0 ; tt < t ; tt ++ ) { int x = scan . nextInt ( ) ; ArrayList < Integer > nums = new ArrayList < Integer > ( ) ; for ( int i = 0 ; i < x ; i ++ ) { int temp = scan . nextInt ( ) ; nums . add ( temp ) ; } if ( nums . size ( ) == 1 ) { System . out . println ( " YES " ) ; continue ; } Collections . sort ( nums ) ; for ( int i = 0 ; i < nums . size ( ) - 1 ; i ++ ) { if ( nums . get ( i + 1 ) - nums . get ( i ) <= 1 ) { nums . remove ( i ) ; i -- ; } } System . out . println ( nums . size ( ) == 1 ? " YES " : " NO " ) ; } }
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