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  • 二叉查找树 转 双链表

    题目的要求如上图所示

    测试用例(先构造二叉查找树)

    void buildBSTreeNode(BSTreeNode* head,int data){
    node = (BSTreeNode*)malloc(sizeof(BSTreeNode));
    node->data = data;
    node->m_Left = NULL;
    node->m_Right = NULL;
    BSTreeNode* p = head;
    while(p){
    if(node->data > p->data){
    if(!p->m_Right){
    p->m_Right = node;
    return ;
    }
    p = p->m_Right;
    else
    if(node->data < p->data){
    if(!p->m_Left){
    p->m_Left = node;
    return ;
    }
    p = p->m_Left;
    }
    else
    {
    printf("已存在 ");
    return ;
    }
    }
    }
    int main(){
    BSTreeNode* head = (BSTreeNode*)malloc(sizeof(BSTreeNode));
    head->m_Left = NULL;
    head->m_Right = NULL;
    int data;
    printf("Enter data(end with 0)
    ");
    scanf("%d",&data);
    head->data = data;
    while(data){
       printf("Enter data(end with 0)
    ");
       scanf("%d",&data);
       if(!data)
           break;
       buildBSTree(head, data);
    }
    }


    释放内存:

    void freeBSTree(BSTreeNode* head){
    if(head->m_Left)
      freeBSTree(head->m_Left);
    if(head->m_Right)
      freeBSTree(head->m_Right)
    free(head);
    }   

    自己也想不出好的方法,只能是参考别人的

    节点:

    struct BSTreeNode{
    int data;
    BSTreeNode* m_Left;
    BSTreeNode* m_Right;
    };

    节点转换:(方法一)
    (采用递归的方法,将左子树和右子树以此转化为链表)

    BSTreeNode* ConvertNode(BSTreeNode * node, bool isLeft){
    //如果是左子树,则返回最大节点;否则,返回最小节点
    if(!node)
    return NULL;
    BSTreeNode* Left = NULL;
    BSTreeNode* Right = NULL;
    if(BSTreeNode->m_Left)
       Left = ConvertNode(BSTreeNode->m_Left,true);
    if(Left)
      Left->m_Right = node;
    node->m_Left = Left;
    if(BSTreeNode->m_Right)
      Right = ConvertNode(BSTreeNode->m_Right,false);
    if(Right)
      Right->m_Left = node;
    node->m_Right = Right;
    BSTreeNode* temp = node;
    if(isLeft)
      while(temp->m_Right)
         temp = temp->m_Right;
    else
      while(temp->m_Left)
         temp =temp->m_Left;
    return temp;
    }
          

    主函数:

    #include<stdio.h>
    int main(){
    head = ConvertNode(head,false);
    //假设head为二叉查找树,则返回的就是最小的节点,再遍历head即可
    return 0;
    }

    节点转换(方法二)
    采用中序遍历二叉树

    void ConvertNode2(BSTreeNode* node, BSTreeNode*& lastOfList){
    BSTreeNode* currentNode = node;
    if(!node)
      return ;
    if(node->m_Left)
      ConvertNode2(node->m_Left, lastOfList);
    if(lastOfList)
      lastOfList->m_Right = currentNode;
    currentNode->m_Left = lastOfList;
    lastOfList = currentNode;
    if(node->m_Right)
      ConvertNode2(node->m_Right,lastOfList);
    }

    主函数:

    int main(){
    BSTreeNode* lastOfList = NULL;
    ConvertNode2(head,lastOfList);
    //使指针移到首节点
    while(head->m_Left)
      head = head->m_Left;
    return 0;
    }
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  • 原文地址:https://www.cnblogs.com/idealing/p/3390237.html
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