Method upheap

lectures/27-huffman-coding/code/Heap.java:18–30

(int index)

        return list.size();
    }
    private void upheap(int index){

        if(index == 0){
            return;
        }

        int p = parent(index);

        if(list.get(index).compareTo(list.get(p)) < 0){
            swap(index, p);
            upheap(p);
        }
    }

    public T remove() throws Exception{
        if(list.isEmpty()){