$245$ pointsSuppose you call the mystery function with the root of this given tree:unsigned mystery $($TreeNode$*$ r $)\{$if $($ r$==$ nullptr$)\{$

$3$ return $0$;

int count $=$;

count $+=$ mystery $(r$left$)$;

count $+=$ mystery $(r-$right$)$;

if $(r1$ left $!=$ nullptr $||$ r$->$right $!=$ nullptr$)\{$

$\}$

count$++$;

$3$

return count;