I've consistently been getting "We couldn't process your submission" errors for a solution that passes all tests for several days in a row.

def height(root): if root is not None: left_height = height(root.left) right_height = height(root.right) return max(left_height, right_height) + 1 else: return -1

py code

I'm sorry what sort of boilerplate code is this supposed to be in C#??? I even know the solution to this but I can't even run...

static int getHeight(Node root) {
	// write code here
}

Testing a dummy case like

 if(root.Left == null && root.Right == null) {
        return 0;
    }
    return 1;

gives COMPILATION errors:

Solution.cs(1,22): error CS0246: The type or namespace name 'Node' could not be found (are you missing a using directive or an assembly reference?)
Solution.cs(1,12): warning CS8321: The local function 'getHeight' is declared but never used

Isn't root supposed to be initialized and passed by wrapper code???

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Solution in Java:

public static int height(Node root) {
      	// Write your code here.
        if (root == null) {
            return -1;
        } else {
            return 1 + Math.max(height(root.left), height(root.right));
        }
    }