Java 8

public static int height(Node root) {
        if(root==null){
        return -1;
        }

        int left = height(root.left);
        int right = height(root.right);

        return Math.max(left, right)+1;
}

node:internal/streams/writable:474 throw new ERR_INVALID_ARG_TYPE( ^ TypeError [ERR_INVALID_ARG_TYPE]: The "chunk" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received type number (6) at _write (node:internal/streams/writable:474:13)

getting this though solution is fine :/

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