static void getPermutation ( int a [ ] , int n ) {
  int [ ] ans = new int [ n ] ;
  ans [ 0 ] = a [ 0 ] ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) ans [ i ] = a [ i ] - a [ i - 1 ] ;
  boolean [ ] present = new boolean [ n + 1 ] ;
  for ( int i = 0 ;
  i < ans . length ;
  i ++ ) {
    if ( present [ ans [ i ] ] ) {
      System . out . print ( "-1" ) ;
      return ;
    }
    else present [ ans [ i ] ] = true ;
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) System . out . print ( ans [ i ] + " " ) ;
}

static void getPermutation ( int a [ ] , int n ) { int [ ] ans = new int [ n ] ; ans [ 0 ] = a [ 0 ] ; for ( int i = 1 ; i < n ; i ++ ) ans [ i ] = a [ i ] - a [ i - 1 ] ; boolean [ ] present = new boolean [ n + 1 ] ; for ( int i = 0 ; i < ans . length ; i ++ ) { if ( present [ ans [ i ] ] ) { System . out . print ( " - 1" ) ; return ; } else present [ ans [ i ] ] = true ; } for ( int i = 0 ; i < n ; i ++ ) System . out . print ( ans [ i ] + " ▁ " ) ; }
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