4.7

#include <iostream>
#include <string>
#include <fstream>

using namespace std;

#define MAX 100

typedef struct
{
    string name;
    int books[5];
}
lib;

typedef struct
{
    int id;
    int year;
    string genre;
}
product;

typedef struct auth
{
    string name;
    int books[5];
    auth()
    {
        for (int i = 0; i < 5; ++i) books[i] = 0;
    }
}
auth;


void manage(string library, string book, string author){
    // TODO
    // Save info
    lib libs[MAX];
    product books[MAX];
    auth authors[MAX];

    // Read file library
    ifstream inLib(library);
    int n;
    inLib >> n;
    for (int i = 0; i < n; ++i)
    {
        inLib >> libs[i].name;
        for (int j = 0; j < 5; ++j)
        {
            inLib >> libs[i].books[j];
        }
    }

    // Read file book
    ifstream inBook(book);
    int m;
    inBook >> m;
    for (int i = 0; i < m; ++i)
    {
        inBook >> books[i].id;
        inBook >> books[i].year;
        inBook >> books[i].genre;
    }

    // Read file author
    ifstream inAuth(author);
    int p;
    inAuth >> p;
    string s;
    getline(inAuth, s);
    int id, index;
    for (int i = 0; i < p; ++i)
    {
        getline(inAuth, s);
        ofstream outTemp("temp.txt");
        outTemp << s;
        outTemp.close();
        ifstream inTemp("temp.txt");
        inTemp >> authors[i].name;
        index = 0;
        while (inTemp >> id)
        {
            authors[i].books[index] = id;
            ++index;
        }
        inTemp.close();
    }

    // Read input
    string lib_name, auth_name;
    cin >> lib_name;
    cin >> auth_name;

    int auth_index = -1;
    for (int i = 0; i < p; ++i)
    {
        if (auth_name == authors[i].name)
        {
            auth_index = i;
            break;
        }
    }

    int lib_index = -1;
    for (int i = 0; i < n; ++i)
    {
        if (lib_name == libs[i].name)
        {
            lib_index = i;
            break;
        }
    }

    if (auth_index == -1||lib_index == -1)
    {
        cout << "False";
        return;
    }

    for (int i = 0; i < 5; ++i)
    {
        id = authors[auth_index].books[i];
        if (id == 0) break;
        for (int j = 0; j < 5; ++j)
        {
            if (id == libs[lib_index].books[j])
            {
                cout << "True";
                return;
            }
        }
    }

    cout << "False";
}

int main()
{
    string library = "library.txt";
    string book = "book.txt";
    string author = "author.txt";
    manage(library, book, author);
}