Inflearn Community Q&A

int height = 0;
int maxHeight = 0;
int GetHeight(NodeRef root) {
	
	height++;

	if (root->children.empty()) {
		return height;
	}
	
	for (NodeRef child : root->children) {
		GetHeight(child);
		if (maxHeight <= height) {
			maxHeight = height;
		}
		height--;
	}

	return maxHeight;
}