Can someone tell me if is there anything wrong with my code

Question

Can someone help me with this question in c++

Assume you have a system with the followoing entities
Region:Id,lan,width,int area() //zero
City:id,lan,width area()
Country:id,lan,width city*A //array of cities area()
1. Implement the above system using inheritance in the best possible way. Keep every object size as small as possible. Implement all methods (setter/getter/constructors and destructors) Note that the region area is 0 while the city is len*width and the country is the sum of their cities.
2. Create array of countries called Arab of 22 countries. Write a function fill that fills the array Arab
3. Write a method that finds the city that has the max area in a country
4. Write a method that sorts the cities in a country from the largest to the smallest area
5. Write a function that returns array of countries of the same area of Arab
6. Write a function that compares between two countries. It returns true if country1 area > country2 area.
7. Write a function to move a city from one country to another.
https://code.sololearn.com/cLJlPq1q0BeE
https://code.sololearn.com/cLJlPq1q0BeE/?ref=app
Heres the question and my attempt

Answer 1

Why did you put c as a flair? It has nothing to do with c.