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看来我为霍夫曼编码程序创建二叉树的代码有缺陷。我不知道为什么,但是当我在调试器中检查根节点时,左节点指向字母 N,右节点指向父节点。父节点的左节点指向字母N,而右节点指向一个父节点。该父节点的左子节点是字母 N,而...(您知道这是怎么回事)。这是问题所在的代码:

huff_sort(nodes); // sort nodes by weight

    //-------BUILDING TREE------
    while(nodes->size() != 1){ //Sorts nodes by weight and then removes two of them and replaces them with one
        int w= (**beg).weight + (**(beg+1)).weight;
        Node* p = new Node;
        p->set_node(w, '*', *nodes->begin(), *(nodes->begin()+1)); //making it the parent node of the two lowest nodes
        nodes->erase(nodes->begin(), nodes->begin()+2);
        unsigned int i = 0;
        while(w > (*nodes)[i]->weight && i <= nodes->size()){ //finds where to insert the parent node based on weight
            i++;
        }
        if(i > nodes->size()) //if it needs to be inserted at the end
            nodes->push_back(p);
        else
            nodes->insert(nodes->begin()+i, p);
        delete p;
    }

从之前的调试中,我知道 huff_sort 函数有效。

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1 回答 1

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在循环结束时,您执行的操作delete p会使指针无效并释放您刚刚插入的节点。

于 2012-07-25T07:04:58.807 回答