static int sum ( int ar [ ] , int n ) {
  HashMap < Integer , Integer > mp = new HashMap < > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    mp . put ( ar [ i ] , 0 ) ;
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    mp . put ( ar [ i ] , mp . get ( ar [ i ] ) + 1 ) ;
  }
  int sum = 0 ;
  for ( Map . Entry p : mp . entrySet ( ) ) {
    n -= ( int ) p . getValue ( ) ;
    sum += n ;
  }
  return sum ;
}

static int sum ( int ar [ ] , int n ) { HashMap < Integer , Integer > mp = new HashMap < > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { mp . put ( ar [ i ] , 0 ) ; } for ( int i = 0 ; i < n ; i ++ ) { mp . put ( ar [ i ] , mp . get ( ar [ i ] ) + 1 ) ; } int sum = 0 ; for ( Map . Entry p : mp . entrySet ( ) ) { n -= ( int ) p . getValue ( ) ; sum += n ; } return sum ; }
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