bool operator < (const node &tmp) const {
        int p1 = 0, p2 = 0;
        if(cost > tmp.cost) {
            p1++;
        }
        else {
            p2++;
        }
        if(passed < tmp.passed) {
            p1++;
        }
        else {
            p2++;
        }
        return p1 < p2;
    }