C++ 删除二叉树中具有两个子节点的节点

C++ 删除二叉树中具有两个子节点的节点,c++,pointers,binary-tree,C++,Pointers,Binary Tree,这就是我到目前为止的代码。我想我在很大程度上已经理解了逻辑,但我还是坚持要有两个孩子。。我已经弄明白了我必须使用什么样的算法才能使它工作(我在函数的底部用注释进行了注释),我只是不知道如何开始。。。有人能给我指一下正确的方向吗 以下是我到目前为止的情况: void BinaryTree::remove(int data){ // Is the data valid? if(data < 0){ cerr << data << " is not valid.

这就是我到目前为止的代码。我想我在很大程度上已经理解了逻辑,但我还是坚持要有两个孩子。。我已经弄明白了我必须使用什么样的算法才能使它工作(我在函数的底部用注释进行了注释),我只是不知道如何开始。。。有人能给我指一下正确的方向吗

以下是我到目前为止的情况:

void BinaryTree::remove(int data){
// Is the data valid?
if(data < 0){
    cerr << data << " is not valid.  Must be a positive integer value."  << endl;
}
else{
    // Find the node
    BinNode* loc = root;
    BinNode* parent = nullptr;
    bool found = false;
    while(!found && loc != nullptr){
        if(data > loc->data){
            parent = loc;
            loc = loc->right;
        }
        else if(data < loc->data){
            parent = loc;
            loc = loc->left;
        }
        else found = true;
    }

    // If there is a parent, take care of the pointer
    if(parent != nullptr){
        if(loc->data < parent->data)
            parent->left = nullptr;
        else if(loc->data > parent->data)
            parent->right = nullptr;
    }
    // If there are children, save pointers to them
    BinNode* leftChild = nullptr;
    BinNode* rightChild = nullptr;  
    if(loc->left != nullptr)
        leftChild = loc->left;
    if(loc->right != nullptr)
        rightChild = loc->right;

    // So now pointers to the children have been saved (if they exist) and
    // parent pointers have been taken care of (if they exist) the node can be deleted
    // If no children exist simply just delete the node and return
    delete loc;
    // If one child exists
    if(leftChild != nullptr || rightChild != nullptr){  
        if(leftChild != nullptr){
            if(leftChild->data < parent->data)
                parent->left = leftChild;
            else if(leftChild->data > parent->data)
                parent->right = leftChild;
        }
        else if(rightChild != nullptr){
            if(rightChild->data < parent->data)
                parent->left = rightChild;
            else if(rightChild->data > parent->data)
                parent->right = rightChild;
        }       
    }

    // Both children exist...this sucks.
    else if(leftChild != nullptr && rightChild != nullptr){
        // Find a minimum in the right subtree
        BinNode * min = root;
        BinNode * minParent = nullptr;
        while(min->left != nullptr){
            minParent = min;
            min = min->left;
        }
        // Replace value of the node to be removed with the found minimum
        loc = new BinNode(min->data);

        // Delete the remaining duplicate node
        if(minParent != nullptr)
            minParent->left = nullptr;
        delete min;
    }
}
}
void BinaryTree::remove(int数据){
//数据有效吗?
如果(数据<0){
cerr权利;
}
else if(数据data){
父母=loc;
loc=loc->left;
}
else found=true;
}
//如果有父对象,请注意指针
if(父级!=nullptr){
如果(位置->数据<父级->数据)
父->左=空PTR;
否则如果(loc->data->parent->data)
父->右=nullptr;
}
//如果有子对象,请保存指向它们的指针
BinNode*leftChild=nullptr;
BinNode*rightChild=nullptr;
如果(loc->left!=nullptr)
leftChild=loc->left;
如果(loc->right!=nullptr)
rightChild=loc->right;
//因此,现在指向子对象的指针已经保存(如果存在)并且
//父指针已得到处理(如果存在),可以删除节点
//如果不存在子节点,只需删除节点并返回
删除loc;
//如果有一个孩子
如果(leftChild!=nullptr | | rightChild!=nullptr){
if(leftChild!=nullptr){
if(leftChild->datadata)
父->左=左子;
else if(leftChild->data>parent->data)
父->右=左子;
}
else if(rightChild!=nullptr){
如果(rightChild->datadata)
父->左=右子;
else if(rightChild->data->parent->data)
父->右=rightChild;
}       
}
//两个孩子都存在……这太糟糕了。
else if(leftChild!=nullptr&&righchild!=nullptr){
//在右子树中查找最小值
BinNode*min=根节点;
BinNode*minParent=nullptr;
同时(最小->左!=nullptr){
minParent=min;
最小=最小->左;
}
//用找到的最小值替换要删除的节点的值
loc=新的BinNode(最小->数据);
//删除剩余的重复节点
if(minParent!=nullptr)
minParent->left=nullptr;
删除min;
}
}
}

我们到了。这似乎奏效了。如果有人对我如何优化这个问题或我需要解决的问题有任何建议,请说出来!谢谢

void BinaryTree::remove(int data){
// Is the data valid?
if(data < 0){
    cerr << data << " is not valid.  Must be a positive integer value."  << endl;
}
else{
    // Find the node
    BinNode* loc = root;
    BinNode* parent = nullptr;
    bool found = false;
    while(!found && loc != nullptr){
        if(data > loc->data){
            parent = loc;
            loc = loc->right;
        }
        else if(data < loc->data){
            parent = loc;
            loc = loc->left;
        }
        else found = true;

    // If there are children, save pointers to them
    BinNode* leftChild = nullptr;
    BinNode* rightChild = nullptr;  
    if(loc->left != nullptr)
        leftChild = loc->left;
    if(loc->right != nullptr)
        rightChild = loc->right;

    // So now pointers to the children have been saved (if they exist) and
    // parent pointers have been taken care of (if they exist) the node can be deleted
    // If no children exist simply just delete the node and return

    // Check if two children exist
    if(leftChild != nullptr && rightChild != nullptr){

        // Find a minimum in the right subtree
        BinNode * min = loc->right;
        BinNode * minParent = loc;
        while(min->left != nullptr){
            minParent = min;
            min = min->left;
        }
        // Replace value of the node to be removed with the found minimum
        loc->data = min->data;

        // Delete the duplicate
        if(minParent != loc)
            minParent->left = nullptr;
        else minParent->right = nullptr;
        delete min;
    }

    // If one child exists
    // Need to handle if it is the root here
    // change root pointer to remaining child
    else if(leftChild != nullptr || rightChild != nullptr){ 
        // If there is a parent, take care of the pointer
        if(parent != nullptr){
            if(loc->data < parent->data)
                parent->left = nullptr;
            else if(loc->data > parent->data)
                parent->right = nullptr;

        // Now loc can be deleted
        delete loc;
        if(leftChild != nullptr){
            if(parent != nullptr){
                if(leftChild->data < parent->data)
                    parent->left = leftChild;
                else if(leftChild->data > parent->data)
                    parent->right = leftChild;
            }
            // If it is the root
            else{
                root = leftChild;
            }
        }
        else if(rightChild != nullptr){
            if(parent != nullptr){
                if(rightChild->data < parent->data)
                    parent->left = rightChild;
                else if(rightChild->data > parent->data)
                parent->right = rightChild;
            }
            // If it is the root
            else{
                root = rightChild;
            }
        }       
    }

    // If there are no children
    else if (leftChild == nullptr && rightChild == nullptr){
        // If there is a parent, take care of the pointer
        if(parent != nullptr){
            if(loc->data < parent->data)
                parent->left = nullptr;
            else if(loc->data > parent->data)
                parent->right = nullptr;
        }
        // If it is the root
        else 
            root = nullptr;
        delete loc;
    }
}
void BinaryTree::remove(int数据){
//数据有效吗?
如果(数据<0){
cerr权利;
}
else if(数据data){
父母=loc;
loc=loc->left;
}
else found=true;
//如果有子对象,请保存指向它们的指针
BinNode*leftChild=nullptr;
BinNode*rightChild=nullptr;
如果(loc->left!=nullptr)
leftChild=loc->left;
如果(loc->right!=nullptr)
rightChild=loc->right;
//因此,现在指向子对象的指针已经保存(如果存在)并且
//父指针已得到处理(如果存在),可以删除节点
//如果不存在子节点,只需删除节点并返回
//检查是否存在两个孩子
if(leftChild!=nullptr&&righchild!=nullptr){
//在右子树中查找最小值
BinNode*min=loc->right;
BinNode*minParent=loc;
同时(最小->左!=nullptr){
minParent=min;
最小=最小->左;
}
//用找到的最小值替换要删除的节点的值
loc->data=min->data;
//删除副本
if(minParent!=loc)
minParent->left=nullptr;
else minParent->right=nullptr;
删除min;
}
//如果有一个孩子
//如果它是根,则需要处理
//将根指针更改为剩余子级
else如果(leftChild!=nullptr | | rightChild!=nullptr){
//如果有父对象,请注意指针
if(父级!=nullptr){
如果(位置->数据<父级->数据)
父->左=空PTR;
否则如果(loc->data->parent->data)
父->右=nullptr;
//现在可以删除loc
删除loc;
if(leftChild!=nullptr){
if(父级!=nullptr){
if(leftChild->datadata)
父->左=左子;
else if(leftChild->data>parent->data)
父->右=左子;
}
//如果它是根
否则{
root=leftChild;
}
}
else if(rightChild!=nullptr){
if(父级!=nullptr){
如果(rightChild->datadata)
父->左=右子;
else if(rightChild->data->parent->data)
父->右=rightChild;
}
//如果它是根
否则{
根=右子代;
}
}       
}
//如果没有孩子
else if(leftChild==nullptr&&righchild==nullptr){
//如果有父对象,请注意指针
if(父级!=nullptr){
如果(位置->数据<父级->数据)
父->左=空PTR;
否则如果(loc->data->parent->data)
父->右=nullptr;
}
//如果它是根
其他的
root=nullptr;
删除loc;
}
}

这是一个二叉搜索树(),而不仅仅是一个二叉树。请参阅如何在普通二叉树中执行删除操作?二叉树的结构比二叉搜索树小,因此您可以选择任何叶节点并将其交换到位。您可以