bool checkSimpleWay(int source, int dest) {
    for (int i = 1; i < v[source].size(); i++) {
        for (int j = 1; j < v[i].size(); j++) {
            if (i == j) continue;

            if (v[i] == dest) {
                return true;
            }
        }
    }
    return false;
}