vector<int> matchingStrings(vector<string> strings, vector<string> queries) {
    vector<int> ret;
    unordered_map<string, int> m;
    for (const string &s : strings) {
        m[s]++;
    }
    for (const string &q : queries) {
        if (m[q])
            ret.push_back(m[q]);
        else
            ret.push_back(0);
    }
    return (ret);
}