#include <iostream> #include <vector> #include <sstream> using namespace std; struct TreeNode { string val; TreeNode* left; TreeNode* right; TreeNode(string x) : val(x), left(nullptr), right(nullptr) {} }; TreeNode* buildTreeHelper(const vector<string>& preorder, int& pos, const string& sep) { if (pos >= preorder.size() || preorder[pos] == sep) { ++pos; return nullptr; } string s = preorder[pos]; ++pos; TreeNode* root = new TreeNode(s); root->left = buildTreeHelper(preorder, pos, sep); root->right = buildTreeHelper(preorder, pos, sep); return root; } TreeNode* buildTree(const vector<string>& preorder, const string& sep) { int pos = 0; return buildTreeHelper(preorder, pos, sep); } void preorder1(TreeNode* root) { if (!root) return; cout << root->val << ","; preorder1(root->left); preorder1(root->right); } void inorder(TreeNode* root) { if (!root) return; inorder(root->left); cout << root->val << ","; inorder(root->right); } void postorder(TreeNode* root) { if (!root) return; postorder(root->left); postorder(root->right); cout << root->val << ","; } int main() { string sep; getline(cin, sep); vector<string> preorder; string line; getline(cin, line); stringstream ss(line); string s; while (getline(ss, s, ' ')) { preorder.push_back(s); } TreeNode* root = buildTree(preorder, sep); cout << "Preorder: "; preorder1(root); cout << endl; cout << "Inorder: "; inorder(root); cout << endl; cout << "Postorder: "; postorder(root); cout << endl; return 0; }如何避免在输出序列最后多输出一个逗号

#include <iostream>

#include <iostream> #include <iomanip> using namespace std; int main() { int n,i,k=0; cin>>n; for(i=n*n;i>=1;i--) { cout<<setw(5)<<i; k++; if(k%n==0) cout<<endl; } cout<<endl; return 0;

使用include <iostream>时一定要加using namespace std

#include <iostream> #include<iomanip> using namespace std;九九乘法表

第一次编译

#include 的用法

在C++编程语言中，#include<vector> 是一个非常重要的头文件，它提供了动态数组的功能实现——即 std::vector 类模板。std::vector 是一种非常灵活且高效的数据结构，它可以像数组一样存储元素，并能够自动...

#include <iostream> #include <queue> #include<string> using namespace std; struct TreeNode { int val; TreeNode* left; TreeNode* right; TreeNode(int x) : val(x), left(NULL), right(NULL) {} }; // 递归实现先序遍历 void preorderTraversal(TreeNode* root) { if (root) { cout << root->val << " "; preorderTraversal(root->left); preorderTraversal(root->right); } } // 非递归实现层次遍历 void levelOrderTraversal(TreeNode* root) { if (!root) { return; } queue<TreeNode> q; q.push(root); while (!q.empty()) { TreeNode cur = q.front(); q.pop(); cout << cur->val << " "; if (cur->left) { q.push(cur->left); } if (cur->right) { q.push(cur->right); } } } int main() { // 建立二叉树 TreeNode* root = new TreeNode(65); root->left = new TreeNode(66); root->right = new TreeNode(67); root->left->left = new TreeNode(68); root->left->right = new TreeNode(69); root->left->left->left = new TreeNode(72); root->left->right->right = new TreeNode(73); root->right->left = new TreeNode(70); root->right->right = new TreeNode(71); root->right->left->left = new TreeNode(74); // 先序遍历 cout << "Preorder Traversal: "; preorderTraversal(root); cout << endl; // 层次遍历 cout << "Level Order Traversal: "; levelOrderTraversal(root); cout << endl; return 0; }怎么将代码内节点的数字改成字母

using namespace std; struct TreeNode { string val; // 将节点的值从 int 类型改为 string 类型 TreeNode* left; TreeNode* right; TreeNode(string s) : val(s), left(NULL), right(NULL) {} // 将节点的值...

#include <iostream> #include <queue> #include <string> using namespace std;struct TreeNode { string val; // 将节点的值从 int 类型改为 string 类型 TreeNode* left; TreeNode* right; TreeNode(string s) : val(s), left(NULL), right(NULL) {} // 将节点的值初始化为字符串类型 }; // 递归实现先序遍历 void preorderTraversal(TreeNode* root) { if (root) { cout << root->val << " "; preorderTraversal(root->left); preorderTraversal(root->right); } } // 非递归实现层次遍历 void levelOrderTraversal(TreeNode* root) { if (!root) { return; } queue<TreeNode> q; q.push(root); while (!q.empty()) { TreeNode cur = q.front(); q.pop(); cout << cur->val << " "; if (cur->left) { q.push(cur->left); } if (cur->right) { q.push(cur->right); } } } int main() { // 建立二叉树 TreeNode* root = new TreeNode("A"); // 将节点的值从数字改为字母 root->left = new TreeNode("B"); root->right = new TreeNode("C"); root->left->left = new TreeNode("D"); root->left->right = new TreeNode("E"); root->left->left->left = new TreeNode("H"); root->left->right->right = new TreeNode("I"); root->right->left = new TreeNode("F"); root->right->right = new TreeNode("G"); root->right->left->left = new TreeNode("J"); // 先序遍历 cout << "Preorder Traversal: "; preorderTraversal(root); cout << endl; // 层次遍历 cout << "Level Order Traversal: "; levelOrderTraversal(root); cout << endl; return 0; }请给我讲解一下这段代码

其中，二叉树的每个节点存储了一个字符串类型的值，使用结构体 TreeNode 来表示。代码中包含两种遍历方式：先序遍历和层次遍历。先序遍历是一种深度优先遍历方式，遍历顺序为：根节点、左子树、右子树。代码中...

#include<iostream>using namespace std;struct TreeNode{ int val; TreeNode* left; TreeNode* right; TreeNode(int v): val(v), left(NULL), right(NULL) {}};TreeNode* buildTree(){ int val; cin >> val; if(val == -1) // 空节点 return NULL; TreeNode* root = new TreeNode(val); root->left = buildTree(); root->right = buildTree(); return root;}int main(){ cout << "请输入二叉树的先序遍历序列（空节点用-1表示）：" << endl; TreeNode* root = buildTree(); return 0;}用层次遍历该二叉树

using namespace std; struct TreeNode{ int val; TreeNode* left; TreeNode* right; TreeNode(int v): val(v), left(NULL), right(NULL) {} }; TreeNode* buildTree(){ int val; cin >> val; if(val == -1...

#include <iostream> #include <queue> using namespace std; struct TreeNode { int val; TreeNode* left; TreeNode* right; TreeNode(int x) : val(x), left(NULL), right(NULL) {} }; // 递归实现先序遍历 void preorderTraversal(TreeNode* root) { if (root) { cout << root->val << " "; preorderTraversal(root->left); preorderTraversal(root->right); } } // 非递归实现层次遍历 void levelOrderTraversal(TreeNode* root) { if (!root) { return; } queue<TreeNode> q; q.push(root); while (!q.empty()) { TreeNode cur = q.front(); q.pop(); cout << cur->val << " "; if (cur->left) { q.push(cur->left); } if (cur->right) { q.push(cur->right); } } } int main() { // 建立二叉树 TreeNode* root = new TreeNode(A); root->left = new TreeNode(B); root->right = new TreeNode(C); root->left->left = new TreeNode(D); root->left->right = new TreeNode(E); root->right->left = new TreeNode(6); root->right->right = new TreeNode(7); // 先序遍历 cout << "Preorder Traversal: "; preorderTraversal(root); cout << endl; // 层次遍历 cout << "Level Order Traversal: "; levelOrderTraversal(root); cout << endl; return 0; }提供的二叉树先序遍历为A，B，D,H,,E,I,C,F,J,G。请在代码中做出修改

using namespace std; struct TreeNode { int val; TreeNode* left; TreeNode* right; TreeNode(int x) : val(x), left(NULL), right(NULL) {} }; // 递归实现先序遍历 void preorderTraversal(TreeNode* root...

代码改进，不使用cout<<endl结构#include <iostream> #include <queue> #include <stack> #include <string> using namespace std; struct Student { string name; int number; int score; }; struct TreeNode { Student data; TreeNode* left; TreeNode* right; TreeNode(Student s) : data(s), left(nullptr), right(nullptr) {} }; void postOrder(TreeNode* root) { if (!root) return; postOrder(root->left); postOrder(root->right); cout << root->data.name << " " << root->data.number << " " << root->data.score << endl; } void preOrder(TreeNode* root) { stack<TreeNode> s; s.push(root); while (!s.empty()) { TreeNode node = s.top(); s.pop(); if (node) { cout << node->data.name << " " << node->data.number << " " << node->data.score << endl; s.push(node->right); s.push(node->left); } } } void levelOrder(TreeNode* root) { queue<TreeNode> q; q.push(root); while (!q.empty()) { TreeNode node = q.front(); q.pop(); if (node) { cout << node->data.name << " " << node->data.number << " " << node->data.score << endl; q.push(node->left); q.push(node->right); } } } int main() { Student students[] = { {"Lei Zhenzi", 101401, 82}, {"Jiang Ziya", 100032, 90}, {"Ne Zha", 101674, 70}, {"Shen Gongbao", 101982, 87}, {"Jiu Weihu", 107431, 75}, {"Tian Zun", 100001, 98}, {"Tai Yi", 101009, 81}, {"Yang Jian", 101321, 63}, {"Huang Feihu", 101567, 72}, {"Zhou Wang", 108160, 55}, {"Li Jing", 102456, 84}, {"Tu Xingsun", 102245, 65}, }; int n = sizeof(students) / sizeof(Student); TreeNode* root = new TreeNode(students[0]); queue<TreeNode> q; q.push(root); for (int i = 1; i < n; i += 2) { TreeNode parent = q.front(); q.pop(); parent->left = new TreeNode(students[i]); q.push(parent->left); if (i + 1 < n) { parent->right = new TreeNode(students[i + 1]); q.push(parent->right); } } cout << "Post-order traversal: " << endl; postOrder(root); cout << "Pre-order traversal: " << endl; preOrder(root); cout << "Level-order traversal: " << endl; levelOrder(root); return 0; }

#include <iostream> #include <queue> #include <stack> #include <string> using namespace std; struct Student { string name; int number; int score; }; struct TreeNode { Student data; TreeNode* ...

代码改进，用printf代替cout。#include <iostream> #include <queue> #include <stack> #include <string> using namespace std; struct Student { string name; int number; int score; }; struct TreeNode { Student data; TreeNode* left; TreeNode* right; TreeNode(Student s) : data(s), left(nullptr), right(nullptr) {} }; void postOrder(TreeNode* root) { if (!root) return; postOrder(root->left); postOrder(root->right); cout << root->data.name << " " << root->data.number << " " << root->data.score << endl; } void preOrder(TreeNode* root) { stack<TreeNode> s; s.push(root); while (!s.empty()) { TreeNode node = s.top(); s.pop(); if (node) { cout << node->data.name << " " << node->data.number << " " << node->data.score << endl; s.push(node->right); s.push(node->left); } } } void levelOrder(TreeNode* root) { queue<TreeNode> q; q.push(root); while (!q.empty()) { TreeNode node = q.front(); q.pop(); if (node) { cout << node->data.name << " " << node->data.number << " " << node->data.score << endl; q.push(node->left); q.push(node->right); } } } int main() { Student students[] = { {"Lei Zhenzi", 101401, 82}, {"Jiang Ziya", 100032, 90}, {"Ne Zha", 101674, 70}, {"Shen Gongbao", 101982, 87}, {"Jiu Weihu", 107431, 75}, {"Tian Zun", 100001, 98}, {"Tai Yi", 101009, 81}, {"Yang Jian", 101321, 63}, {"Huang Feihu", 101567, 72}, {"Zhou Wang", 108160, 55}, {"Li Jing", 102456, 84}, {"Tu Xingsun", 102245, 65}, }; int n = sizeof(students) / sizeof(Student); TreeNode* root = new TreeNode(students[0]); queue<TreeNode> q; q.push(root); for (int i = 1; i < n; i += 2) { TreeNode parent = q.front(); q.pop(); parent->left = new TreeNode(students[i]); q.push(parent->left); if (i + 1 < n) { parent->right = new TreeNode(students[i + 1]); q.push(parent->right); } } cout << "Post-order traversal: " << endl; postOrder(root); cout << "Pre-order traversal: " << endl; preOrder(root); cout << "Level-order traversal: " << endl; levelOrder(root); return 0; }

using namespace std; struct Student { string name; int number; int score; }; struct TreeNode { Student data; TreeNode* left; TreeNode* right; TreeNode(Student s) : data(s), left(nullptr), ...

#include<iostream> using namespace std; #include <stack> // 定义树节点结构体 typedef struct TreeNode { char val;//数据域 TreeNode* left;//左孩子 TreeNode* right;//右孩子 }Tree, TreeNode; void CreateTree(Tree& T) { char x; cin >> x; if (x =='') { T = NULL; return; } else { T = new TreeNode; T->val = x; CreateTree(T->left); CreateTree(T->right); } } // 先序遍历二叉树 void preOrderTraversal(TreeNode* root) { if (root == NULL) return; cout << root->val << endl; preOrderTraversal(root->left); preOrderTraversal(root->right); } // 中序遍历二叉树 void inOrderTraversal(TreeNode* root) { if (root == NULL) return; inOrderTraversal(root->left); cout << root->val << endl; inOrderTraversal(root->right); } void inOrderS(TreeNode* root) { stack<TreeNode> S; TreeNode p = root; while (p || !S.empty()){ if(p->left){ S.push(p); p = p->left; } else{ cout << S.top()->val; p = S.top()->right; S.pop(); } } } // 后序遍历二叉树 void postOrderTraversal(TreeNode* root) { if (root == NULL) return; postOrderTraversal(root->left); postOrderTraversal(root->right); cout << root->val <<endl;} int main() { TreeNode* root = NULL; cout << "请输入二叉树的先序遍历序列，以*表示空节点" << endl; CreateTree(root); stack<int> S; //cout << "先序遍历结果为："<< endl; //preOrderTraversal(root); cout << endl << "中序遍历结果为：" << endl; inOrderS(root); //cout << endl << "后序遍历结果为：" << endl; //postOrderTraversal(root); cout << endl; return 0; } 纠错

1. 第一行代码应该是 #include <iostream> 而非 #include<iostream>。 2. 定义树节点结构体时，结构体名称应为 TreeNode 而非 *Tree。 3. 在 CreateTree 函数中，需要加上 new 关键字来动态分配内存。...

#include <iostream> #include <string> using namespace std; struct TreeNode { int val; TreeNode* left; TreeNode* right; TreeNode(int x) : val(x), left(nullptr), right(nullptr) {} }; void insert(TreeNode& root, int val) { if (root == nullptr) { root = new TreeNode(val); return; } if (val < root->val) { insert(root->left, val); } else if (val > root->val) { insert(root->right, val); } } string search(TreeNode root, int val) { string path = ""; while (root != nullptr) { if (val < root->val) { path += "l"; root = root->left; } else if (val > root->val) { path += "r"; root = root->right; } else { return path; } } return "Nothing."; } void remove(TreeNode& root, int val) { if (root == nullptr) { return; } if (val < root->val) { remove(root->left, val); } else if (val > root->val) { remove(root->right, val); } else { if (root->left == nullptr) { TreeNode* temp = root; root = root->right; delete temp; } else if (root->right == nullptr) { TreeNode* temp = root; root = root->left; delete temp; } else { TreeNode* minNode = root->right; while (minNode->left != nullptr) { minNode = minNode->left; } root->val = minNode->val; remove(root->right, minNode->val); } } } int main() { int Q; cin >> Q; TreeNode* root = nullptr; for (int i = 0; i < Q; i++) { char op; int x; cin >> op >> x; if (op == '+') { insert(root, x); } else if (op == '-') { remove(root, x); } else if (op == '*') { string result = search(root, x); cout << result << endl; } } return 0; }

这段代码是一段二叉搜索树的实现，可以进行插入、删除、查找操作。其中，insert函数实现了插入操作，search函数实现了查找操作，remove函数实现了删除操作。在主函数中，根据输入的操作符进行相应的操作。...

能帮我举例相关输入输出解果吗#include <iostream> #include <stack> using namespace std; // 二叉树结点定义 struct TreeNode { char data; TreeNode left; TreeNode right; }; // 先序遍历（递归） void preOrderTraversal(TreeNode root) { if (root == NULL) { return; } cout << root->data << " "; preOrderTraversal(root->left); preOrderTraversal(root->right); } // 中序遍历（非递归） void inOrderTraversal(TreeNode root) { stack<TreeNode> s; TreeNode p = root; while (p != NULL || !s.empty()) { if (p != NULL) { s.push(p); p = p->left; } else { p = s.top(); s.pop(); cout << p->data << " "; p = p->right; } } } // 后序遍历（递归） void postOrderTraversal(TreeNode root) { if (root == NULL) { return; } postOrderTraversal(root->left); postOrderTraversal(root->right); cout << root->data << " "; } // 二叉树建立 void createTree(TreeNode &root) { char ch; cin >> ch; if (ch == '#') { root = NULL; } else { root = new TreeNode; root->data = ch; createTree(root->left); createTree(root->right); } } int main() { TreeNode *root; createTree(root); cout << "先序遍历结果："; preOrderTraversal(root); cout << endl; cout << "中序遍历结果："; inOrderTraversal(root); cout << endl; cout << "后序遍历结果："; postOrderTraversal(root); cout << endl; return 0; }

当你运行该程序时，程序会提示你输入二叉树的节点信息，其中“#”表示该节点为空。然后程序会根据你的输入建立二叉树，然后分别输出先序遍历、中序遍历和后序遍历的结果。例如，如果你的输入为： ...

代码1：#include<iostream> #include<stdlib.h> using namespace std; struct TreeNode{ int value; TreeNode left; TreeNode right; }; TreeNode creatTree(TreeNode p) { p = (TreeNode)malloc(sizeof(TreeNode)); p->value =0; p->left = NULL; p->right = NULL; return p; } TreeNode insert(TreeNode t,int n) { if (t==NULL) { creatTree(t); } else { if (n<t->value) { t->left=insert(t->left,n); } else if(n>t->value) { t->right=insert(t->right,n); } return t; } } void find(TreeNode t,int a,int b) { if(t==NULL) { return; } if(t->value<=a) { find(t->right,a,b); } else if(t->value>=b) { find(t->left,a,b); } else { find(t->left,a,b); cout<<t->value<<" "; find(t->right,a,b); } } int main() { int n,a,b,value; cin>>n; TreeNode root = NULL; for(int i=0;i<n;i++) { cin>>value; root=insert(root,value); } cin>>a>>b; find(root,a,b); cout<<endl; return 0; }代码2：#include<iostream> #include<stdlib.h> using namespace std; typedef struct node { int val; struct node left; struct node* right; } node; node* insert(node* t, int data) { if (t == NULL) { t=(node)malloc(sizeof(node)); t->val=data; t->left=t->right=NULL; return t; } else { if(data<t->val) { t->left=insert(t->left,data); } else { t->right=insert(t->right,data); } return t; } } void find(node t,int a,int b) { if(t==NULL) { return; } if(t->val<=a) { find(t->right,a,b); } else if(t->val>=b) { find(t->left,a,b); } else { find(t->left,a,b); cout<<t->val<<" "; find(t->right,a,b); } } int main() { int n,a,b; cin>>n; node* root=NULL; int value; for (int i=0;i<n;i++) { cin>>value; root=insert(root,value); } cin>>a>>b; find(root,a,b); return 0; }为什么代码1不能实现代码2的功能，代码1要怎么改进？

代码1和代码2实现的功能是... t->left=insert(t->left,n); } else if(n>t->value) { t->right=insert(t->right,n); } } return t; } 这样修改后，代码1就可以正确地构建二叉搜索树并查找给定范围内的节点了。

#include <iostream> using namespace std; // 二叉树结点定义 struct TreeNode { int val; TreeNode* left; TreeNode* right; TreeNode(int x) : val(x), left(NULL), right(NULL) {} }; // 创建二叉树 TreeNode* createBinaryTree() { int val; cin >> val; if (val == -1) { // 输入 -1 表示该结点为空 return NULL; } TreeNode* root = new TreeNode(val); root->left = createBinaryTree(); root->right = createBinaryTree(); return root; } // 前序遍历二叉树 void preOrderTraversal(TreeNode* root) { if (root == NULL) { return; } cout << root->val << " "; preOrderTraversal(root->left); preOrderTraversal(root->right); } // 中序遍历二叉树 void inOrderTraversal(TreeNode* root) { if (root == NULL) { return; } inOrderTraversal(root->left); cout << root->val << " "; inOrderTraversal(root->right); } // 后序遍历二叉树 void postOrderTraversal(TreeNode* root) { if (root == NULL) { return; } postOrderTraversal(root->left); postOrderTraversal(root->right); cout << root->val << " "; } int main() { TreeNode* root = createBinaryTree(); cout << "前序遍历结果："; preOrderTraversal(root); cout << endl; cout << "中序遍历结果："; inOrderTraversal(root); cout << endl; cout << "后序遍历结果："; postOrderTraversal(root); cout << endl; return 0; }

这段代码实现了二叉树的创建和三种遍历方式（前序、中序、后序）。用户可以通过输入一串数字来创建一个二叉树，其中-1表示该节点为空。然后可以通过调用preOrderTraversal、inOrderTraversal、postOrderTraversal...

#include<iostream> #include<stdlib.h> using namespace std; struct TreeNode { int value; TreeNode left; TreeNode right; }; TreeNode creatTree(TreeNode p) { p = (TreeNode)malloc(sizeof(TreeNode)); p->left = NULL; p->right = NULL; return p; } TreeNode insert(TreeNode t,int n) { if (t==NULL) { t=creatTree(t); t->value=n; return t; } if (n<t->value) { t->left=insert(t->left,n); return t; } if(n>t->value) { t->right=insert(t->right,n); return t; } } void find(TreeNode t,int a,int b) { if(t==NULL) { return; } if(t->value<=a) { find(t->right,a,b); } if(t->value>=b) { find(t->left,a,b); } else { find(t->left,a,b); cout<<t->value<<" "; find(t->right,a,b); } } int main() { int n,a,b,value; cin>>n; TreeNode *root = NULL; for(int i=0;i<n;i++) { cin>>value; insert(root,value); } cin>>a>>b; find(root,a,b); cout<<endl; return 0; }代码为什么没有成功构建二叉查找树

using namespace std; struct TreeNode { int value; TreeNode *left; TreeNode *right; }; TreeNode *creatTree(TreeNode* p) { p = (TreeNode*)malloc(sizeof(TreeNode)); p->value = 0; // 初始化 value ...

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