如何用C++创建一个树？

#include<iostream>
#include<vector>

class TreeNode {
public:
    int value;
    std::vector<TreeNode*> children;

    TreeNode(int value) : value(value) {}

    void addChild(TreeNode* child) {
        children.push_back(child);
    }
};

int main() {
    // 创建一个树
    TreeNode* root = new TreeNode(1);
    TreeNode* child1 = new TreeNode(2);
    TreeNode* child2 = new TreeNode(3);
    TreeNode* child3 = new TreeNode(4);
    TreeNode* child4 = new TreeNode(5);

    root->addChild(child1);
    root->addChild(child2);
    child1->addChild(child3);
    child1->addChild(child4);

    // 遍历树
    std::vector<TreeNode*> nodes = {root};
    while (!nodes.empty()) {
        TreeNode* node = nodes.back();
        nodes.pop_back();
        std::cout<< node->value<< std::endl;
        for (TreeNode* child : node->children) {
            nodes.push_back(child);
        }
    }

    // 释放内存
    delete root;
    delete child1;
    delete child2;
    delete child3;
    delete child4;

    return 0;
}