原文链接

应用C++构建一个二叉树并复制、输入。

程序

#include <stdio.h>#include <stdlib.h>//#include <cstdio>#include <vector>#include<iostream>#include <stack> #include<cstdlib>#include <string>using namespace std;struct TreeNode          // 定义二叉树{    int val;                       // 以后节点值用val示意    struct TreeNode *left;     // 指向左子树的指针用left示意    struct TreeNode *right;    // 指向右子树的指针用right示意    TreeNode(int x) :val(x), left(NULL), right(NULL) { } // 初始化以后结点值为x,左右子树为空};//创立树TreeNode* insert(TreeNode* tree, int value){        TreeNode* node = (TreeNode*)malloc(sizeof(TreeNode)); // 创立一个节点    node->val = value;      // 初始化节点                            // malloc函数能够调配长度    node->left = NULL;    node->right = NULL;    TreeNode* temp = tree;      // 从树根开始    while (temp != NULL)    {        if (value < temp->val)  // 小于根节点就进左子树        {            if (temp->left == NULL)            {                temp->left = node;  // 新插入的数为temp的左子树                return tree;            }            else           // 下一轮判断                temp = temp->left;        }        else           // 否则进右子树        {                if (temp->right == NULL)            {                temp->right = node;  // 新插入的数为temp的右子树                return tree;            }            else           // 下一轮判断                temp = temp->right;        }    }    return tree;} //  ************* 输入图形二叉树 *************void output_impl(TreeNode* n, bool left, string const& indent){    if (n->right)    {        output_impl(n->right, false, indent + (left ? "|     " : "      "));    }    cout << indent;    cout << (left ? '\\' : '/');    cout << "-----";    cout << n->val << endl;    if (n->left)    {        output_impl(n->left, true, indent + (left ? "      " : "|     "));    }}void output(TreeNode* root){    if (root->right)    {        output_impl(root->right, false, "");    }    cout << root->val << endl;    if (root->left)    {        output_impl(root->left, true, "");    }    system("pause");}//  ******************************************void CopyBiTree(TreeNode* root, TreeNode* newroot) //  复制二叉树{    if (root == nullptr)        return;    else    {        newroot->val = root->val;        if (root->left != nullptr)            newroot->left = new TreeNode(0);        if (root->right != nullptr)            newroot->right = new TreeNode(0);        CopyBiTree(root->left, newroot->left);        CopyBiTree(root->right, newroot->right);    }    //output(newroot);}// ====================测试代码====================int main(){    TreeNode* tree =new TreeNode(10);       // 树的根节点    TreeNode* treeresult;    treeresult = insert(tree, 6);         // 输出n个数并创立这个树    treeresult = insert(tree, 4);    treeresult = insert(tree, 8);    treeresult = insert(tree, 14);    treeresult = insert(tree, 12);    treeresult = insert(tree, 16);    TreeNode* mirroot = new TreeNode(10);    CopyBiTree(treeresult, mirroot); //  复制二叉树    output(treeresult);         //  输入原二叉树    output(mirroot);         //  输入复制的二叉树}

后果

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