static void longest ( int a [ ] , int n , int k ) {
  int [ ] freq = new int [ 7 ] ;
  int start = 0 , end = 0 , now = 0 , l = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    freq [ a [ i ] ] ++ ;
    if ( freq [ a [ i ] ] == 1 ) now ++ ;
    while ( now > k ) {
      freq [ a [ l ] ] -- ;
      if ( freq [ a [ l ] ] == 0 ) now -- ;
      l ++ ;
    }
    if ( i - l + 1 >= end - start + 1 ) {
      end = i ;
      start = l ;
    }
  }
  for ( int i = start ;
  i <= end ;
  i ++ ) System . out . print ( a [ i ] + " " ) ;
}

static void longest ( int a [ ] , int n , int k ) { int [ ] freq = new int [ 7 ] ; int start = 0 , end = 0 , now = 0 , l = 0 ; for ( int i = 0 ; i < n ; i ++ ) { freq [ a [ i ] ] ++ ; if ( freq [ a [ i ] ] == 1 ) now ++ ; while ( now > k ) { freq [ a [ l ] ] -- ; if ( freq [ a [ l ] ] == 0 ) now -- ; l ++ ; } if ( i - l + 1 >= end - start + 1 ) { end = i ; start = l ; } } for ( int i = start ; i <= end ; i ++ ) System . out . print ( a [ i ] + " ▁ " ) ; }
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