C++首先编程实现读入一串字符创建一棵二叉排序树，然后分别实现：二叉排序树的查找；二叉排序树的插入；二叉排序树的删除等操作。

以下是C++实现读入一串字符创建一棵二叉排序树，并实现二叉排序树的查找、插入和删除操作的代码：

#include <iostream>
using namespace std;

// 二叉排序树结点定义
struct BSTNode {
    int data;
    BSTNode* left;    BSTNode* right;
};

// 创建二叉排序树
void createBST(BSTNode*& root, int data) {
    if (root == NULL) {
        root = new BSTNode;
        root->data = data;
        root->left = NULL;
        root->right = NULL;
    }
    else if (data < root->data) {
        createBST(root->left, data);
    }
    else {
        createBST(root->right, data);
    }
}

// 查找二叉排序树
BSTNode* searchBST(BSTNode* root, int data) {
    if (root == NULL || root->data == data) {
        return root;
    }
    else if (data < root->data) {
        return searchBST(root->left, data);
    }
    else {
        return searchBST(root->right, data);
    }
}

// 插入二叉排序树
void insertBST(BSTNode*& root, int data) {
    if (root == NULL) {
        root = new BSTNode;
        root->data = data;
        root->left = NULL;
        root->right = NULL;
    }
    else if (data < root->data) {
        insertBST(root->left, data);
    }
    else {
        insertBST(root->right, data);
    }
}

// 删除二叉排序树
void deleteBST(BSTNode*& root, int data) {
    if (root == NULL) {
        return;
    }
    if (data < root->data) {
        deleteBST(root->left, data);
    }
    else if (data > root->data) {
        deleteBST(root->right, data);
    }
    else {
        if (root->left == NULL && root->right == NULL) {
            delete root;
            root = NULL;
        }
        else if (root->left == NULL) {
            BSTNode* temp = root;
            root = root->right;
            delete temp;
        }
        else if (root->right == NULL) {
            BSTNode* temp = root;
            root = root->left;
            delete temp;
        }
        else {
            BSTNode* temp = root->right;
            while (temp->left != NULL) {
                temp = temp->left;
            }
            root->data = temp->data;
            deleteBST(root->right, temp->data);
        }
    }
}

int main() {
    BSTNode* root = NULL;
    int n, data;
    cout << "请输入二叉排序树结点个数：";
    cin >> n;
    cout << "请输入" << n << "个结点的值：" << endl;
    for (int i = 0; i < n; i++) {
        cin >> data;
        createBST(root, data);
    }
    cout << "请输入要查找的结点值：";
    cin >> data;
    BSTNode* searchResult = searchBST(root, data);
    if (searchResult == NULL) {
        cout << "未找到该结点" << endl;
    }
    else {
        cout << "已找到该结点" << endl;
    }
    cout << "请输入要插入的结点值：";
    cin >> data;
    insertBST(root, data);
    cout << "请输入要删除的结点值：";
    cin >> data;
    deleteBST(root, data);
    return 0;
}