static void printTrib ( int n ) {
  if ( n < 1 ) return ;
  int first = 0 , second = 0 ;
  int third = 1 ;
  System . out . print ( first + " " ) ;
  if ( n > 1 ) System . out . print ( second + " " ) ;
  if ( n > 2 ) System . out . print ( second + " " ) ;
  for ( int i = 3 ;
  i < n ;
  i ++ ) {
    int curr = first + second + third ;
    first = second ;
    second = third ;
    third = curr ;
    System . out . print ( curr + " " ) ;
  }
}

static void printTrib ( int n ) { if ( n < 1 ) return ; int first = 0 , second = 0 ; int third = 1 ; System . out . print ( first + " ▁ " ) ; if ( n > 1 ) System . out . print ( second + " ▁ " ) ; if ( n > 2 ) System . out . print ( second + " ▁ " ) ; for ( int i = 3 ; i < n ; i ++ ) { int curr = first + second + third ; first = second ; second = third ; third = curr ; System . out . print ( curr + " ▁ " ) ; } }
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