Write a short program that will calculate doubles of numbers $1$ to $5$ and print the output exactly as shown below by

using a FOR repetition loop.

number $1,$ number doubled $2$

number $2,$ number doubled $4$

number $3,$ number doubled $6$

number $4,$ number doubled $8$

number $5,$ number doubled $10$

You want to develop a program that determines the optimal route for a salesperson. The user should provide an array of

city codes with GPS coordinates of each city to be visited. The program calculates then the best route and provides the

user with the ordered list of cities that constitute the optimal route.

What are the inputs, outputs and the basic data requirements for this problem?