private static void Helper(LeetCode222TreeNode root)
{
if (root == null)
{
return;
}
_count++;
Helper(root.left);
Helper(root.right);
}
public static int CountNodes(LeetCode222TreeNode root)
{
Helper(root);
return(_count);
}
public LeetCode222TreeNode(int val = 0, LeetCode222TreeNode left = null, LeetCode222TreeNode right = null)
{
this.val = val;
this.left = left;
this.right = right;
}
