private static void Helper(LeetCode199TreeNode root, int level)
{
if (root == null)
{
return;
}
if (level == rightSideNodes.Count)
{
rightSideNodes.Add(root.val);
}
if (root.right != null)
{
Helper(root.right, level + 1);
}
if (root.left != null)
{
Helper(root.left, level + 1);
}
}
public static IList <int> RightSideView(LeetCode199TreeNode root)
{
Helper(root, 0);
return(rightSideNodes);
}
public LeetCode199TreeNode(int val = 0, LeetCode199TreeNode left = null, LeetCode199TreeNode right = null)
{
this.val = val;
this.left = left;
this.right = right;
}