Bidirectional Association

Problem Statement

Create `Author` and `Book` classes. Because they reference each other, use a forward declaration (`class Book;`). When `Author::write(Book* b)` is called, it sets `this->book = b` AND `b->author = this`. It prints ‘[Author] wrote [Book]’ and then on a new line ‘[Book] written by [Author]’ by accessing the properties recursively from the `Book` object.

Input Format

Two strings: Author name then Book title.

Output Format

Print the bidirectional link messages on two lines.

Constraints

No spaces in strings.

Sample Input

Tolkien Hobbit

Sample Output

Tolkien wrote Hobbit
Hobbit written by Tolkien

Explanation

In a bidirectional association, both objects maintain a pointer reference to each other, requiring careful forward declarations in C++.

Starter Code

#include <iostream>
#include <string>

class Book; // Forward declaration

class Author {
public:
    // Write your code here
};

class Book {
public:
    // Write your code here
};

// Implement Author::write here

int main() {
    // Establish bidirectional link and print
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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