帮我实现一个 c++ AVL树

好的，我可以帮您实现一个 C AVL树。以下是代码示例：

#include <stdio.h>
#include <stdlib.h>

typedef struct AVLNode {
    int data;
    int height;
    struct AVLNode *left;
    struct AVLNode *right;
} AVLNode;

int max(int a, int b) {
    return (a > b) ? a : b;
}

int height(AVLNode *node) {
    if (node == NULL) {
        return ;
    }
    return node->height;
}

AVLNode *newNode(int data) {
    AVLNode *node = (AVLNode *) malloc(sizeof(AVLNode));
    node->data = data;
    node->height = 1;
    node->left = NULL;
    node->right = NULL;
    return node;
}

AVLNode *rightRotate(AVLNode *y) {
    AVLNode *x = y->left;
    AVLNode *T2 = x->right;

    x->right = y;
    y->left = T2;

    y->height = max(height(y->left), height(y->right)) + 1;
    x->height = max(height(x->left), height(x->right)) + 1;

    return x;
}

AVLNode *leftRotate(AVLNode *x) {
    AVLNode *y = x->right;
    AVLNode *T2 = y->left;

    y->left = x;
    x->right = T2;

    x->height = max(height(x->left), height(x->right)) + 1;
    y->height = max(height(y->left), height(y->right)) + 1;

    return y;
}

int getBalance(AVLNode *node) {
    if (node == NULL) {
        return ;
    }
    return height(node->left) - height(node->right);
}

AVLNode *insert(AVLNode *node, int data) {
    if (node == NULL) {
        return newNode(data);
    }

    if (data < node->data) {
        node->left = insert(node->left, data);
    } else if (data > node->data) {
        node->right = insert(node->right, data);
    } else {
        return node;
    }

    node->height = 1 + max(height(node->left), height(node->right));

    int balance = getBalance(node);

    if (balance > 1 && data < node->left->data) {
        return rightRotate(node);
    }

    if (balance < -1 && data > node->right->data) {
        return leftRotate(node);
    }

    if (balance > 1 && data > node->left->data) {
        node->left = leftRotate(node->left);
        return rightRotate(node);
    }

    if (balance < -1 && data < node->right->data) {
        node->right = rightRotate(node->right);
        return leftRotate(node);
    }

    return node;
}

void preOrder(AVLNode *root) {
    if (root != NULL) {
        printf("%d ", root->data);
        preOrder(root->left);
        preOrder(root->right);
    }
}

int main() {
    AVLNode *root = NULL;

    root = insert(root, 10);
    root = insert(root, 20);
    root = insert(root, 30);
    root = insert(root, 40);
    root = insert(root, 50);
    root = insert(root, 25);

    printf("Preorder traversal of the constructed AVL tree is: \n");
    preOrder(root);

    return ;
}

这是一个简单的 AVL 树实现，包括插入和前序遍历。您可以根据需要进行修改和扩展。