private LinkedList<Job> optimizeSequence(LinkedList<Job> jobs){
        LinkedList<Job> firsts = new LinkedList<Job>();
        LinkedList<Job> lasts = new LinkedList<Job>();

        while(!jobs.isEmpty()){
            Job next = shortestFrom(jobs);
            jobs.remove(next);
            int times[] = next.getPF2Time();
            if(times[0] <= times[1]){
                firsts.addLast(next);
            }
            else {
                lasts.addFirst(next);
            }
        }
        firsts.addAll(lasts);
        locate(firsts);
        return firsts;
    }