comparator

struct cmp  {
    bool operator() (const pair <int, string> &a, const pair <int, string> &b) const {
        if (a.first > b.first) {
            return true;
        }
        else if (a.first < b.first) {
            return false;
        }
        else if (a.second < b.second) {
            return true;
        }
        return false;
    }
};

set <pair <int, string>, cmp> s;