private static void solve ( int [ ] arr , int n ) {
  int [ ] prefix = new int [ n ] ;
  prefix [ 0 ] = arr [ 0 ] ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) {
    prefix [ i ] = arr [ i ] ^ prefix [ i - 1 ] ;
  }
  int [ ] [ ] cnt = new int [ 2 ] [ ( 1 << 20 ) + 3 ] ;
  cnt [ 1 ] [ 0 ] = 1 ;
  long ans = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    ans += cnt [ i % 2 ] [ prefix [ i ] ] ;
    cnt [ i % 2 ] [ prefix [ i ] ] ++ ;
  }
  System . out . println ( ans ) ;
}

private static void solve ( int [ ] arr , int n ) { int [ ] prefix = new int [ n ] ; prefix [ 0 ] = arr [ 0 ] ; for ( int i = 1 ; i < n ; i ++ ) { prefix [ i ] = arr [ i ] ^ prefix [ i - 1 ] ; } int [ ] [ ] cnt = new int [ 2 ] [ ( 1 << 20 ) + 3 ] ; cnt [ 1 ] [ 0 ] = 1 ; long ans = 0 ; for ( int i = 0 ; i < n ; i ++ ) { ans += cnt [ i % 2 ] [ prefix [ i ] ] ; cnt [ i % 2 ] [ prefix [ i ] ] ++ ; } System . out . println ( ans ) ; }
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