private static LeetCode156TreeNode Helper(LeetCode156TreeNode root)
{
if (root == null)
{
return(null);
}
if (root.left == null)
{
newNode = root;
return(root);
}
var left = Helper(root.left);
left.left = root.right;
left.right = root;
root.left = null;
root.right = null;
return(left.right);
}
public static LeetCode156TreeNode UpsideDownBinaryTree(LeetCode156TreeNode root)
{
Helper(root);
return(newNode);
}
public LeetCode156TreeNode(int val = 0, LeetCode156TreeNode left = null, LeetCode156TreeNode right = null)
{
this.val = val;
this.left = left;
this.right = right;
}
