Serialize and Deserialize N-ary Tree

/*
// Definition for a Node.
class Node {
public:
    int val;
    vector<Node*> children;

    Node() {}

    Node(int _val) {
        val = _val;
    }

    Node(int _val, vector<Node*> _children) {
        val = _val;
        children = _children;
    }
};
*/

class Codec {
public:

    string serialize(Node* root) {
        if(!root)return "#";
        string str = to_string(root->val);

        for(Node* n : root->children)
            str += "," + serialize(n);
        str += ",#";
        return str;
    }

    // Decodes your encoded data to tree.
    Node* deserialize(stringstream& ss) {
        string node;
        getline(ss, node, ',');
        if(node == "#"){
            return nullptr;
        }

        Node* root = new Node( stoi(node) );
        Node* child = deserialize(ss);
        while(child){
            root->children.push_back(child);
            child = deserialize(ss);
        }
        return root;
    }
    Node* deserialize(string data) {
        stringstream ss(data);
        return deserialize(ss);
    }
};