图书管理系统 二叉树 代码 复杂一点

图书管理系统可以通过二叉树来实现，具体的实现方式包括以下几个步骤：

1. 定义一个书籍结构体，包括书名、作者、出版日期、价格等信息；
2. 定义一个二叉树节点结构体，包括书籍结构体指针、左子树指针和右子树指针；
3. 定义一个二叉树类，包括插入节点、删除节点、查找节点等操作；
4. 在插入节点时，可以按照书籍的某个属性（例如书名或者价格）来比较大小，以保证二叉树的有序性；
5. 在删除节点时，需要考虑三种情况：删除叶子节点、删除只有一个子节点的节点、删除有两个子节点的节点。对于有两个子节点的节点，可以选择将其右子树中最小的节点替换到该节点的位置上，从而保证二叉树的有序性不变。

这是一个简单的二叉树实现图书管理系统的思路，具体的代码实现可以参考以下示例：

#include <iostream>
using namespace std;

struct Book {
    string name;
    string author;
    string date;
    double price;
};

struct TreeNode {
    Book* book;
    TreeNode* left;
    TreeNode* right;
};

class BookTree {
public:
    BookTree() {
        root = NULL;
    }

    void insert(Book* book) {
        TreeNode* node = new TreeNode();
        node->book = book;
        node->left = NULL;
        node->right = NULL;

        if (root == NULL) {
            root = node;
            return;
        }

        TreeNode* p = root;
        while (true) {
            if (book->name < p->book->name) {
                if (p->left == NULL) {
                    p->left = node;
                    break;
                } else {
                    p = p->left;
                }
            } else {
                if (p->right == NULL) {
                    p->right = node;
                    break;
                } else {
                    p = p->right;
                }
            }
        }
    }

    void remove(string name) {
        TreeNode* p = root;
        TreeNode* parent = NULL;

        while (p != NULL && p->book->name != name) {
            parent = p;
            if (name < p->book->name) {
                p = p->left;
            } else {
                p = p->right;
            }
        }

        if (p == NULL) {
            return;
        }

        if (p->left == NULL && p->right == NULL) {
            if (parent == NULL) {
                root = NULL;
            } else if (parent->left == p) {
                parent->left = NULL;
            } else {
                parent->right = NULL;
            }

            delete p->book;
            delete p;
        } else if (p->left != NULL && p->right == NULL) {
            if (parent == NULL) {
                root = p->left;
            } else if (parent->left == p) {
                parent->left = p->left;
            } else {
                parent->right = p->left;
            }

            delete p->book;
            delete p;
        } else if (p->left == NULL && p->right != NULL) {
            if (parent == NULL) {
                root = p->right;
            } else if (parent->left == p) {
                parent->left = p->right;
            } else {
                parent->right = p->right;
            }

            delete p->book;
            delete p;
        } else {
            TreeNode* q = p->right;
            TreeNode* q_parent = p;

            while (q->left != NULL) {
                q_parent = q;
                q = q->left;
            }

            if (q_parent == p) {
                q->left = p->left;

                if (parent == NULL) {
                    root = q;
                } else if (parent->left == p) {
                    parent->left = q;
                } else {
                    parent->right = q;
                }

                delete p->book;
                delete p;
            } else {
                q_parent->left = q->right;

                q->left = p->left;
                q->right = p->right;

                if (parent == NULL) {
                    root = q;
                } else if (parent->left == p) {
                    parent->left = q;
                } else {
                    parent->right = q;
                }

                delete p->book;
                delete p;
            }
        }
    }

    Book* search(string name) {
        TreeNode* p = root;

        while (p != NULL && p->book->name != name) {
            if (name < p->book->name) {
                p = p->left;
            } else {
                p = p->right;
            }
        }

        if (p == NULL) {
            return NULL;
        } else {
            return p->book;
        }
    }

private:
    TreeNode* root;
};