👋Learning to code? Check out ourbrand new Bootcampfor beginners!
To try and encourage more sales of different books from a popular 5 book series, a bookshop has decided to offer discounts on multiple book purchases.
One copy of any of the five books costs $8.
If, however, you buy two different books, you get a 5% discount on those two books.
If you buy 3 different books, you get a 10% discount.
If you buy 4 different books, you get a 20% discount.
If you buy all 5, you get a 25% discount.
Note that if you buy four books, of which 3 are different titles, you get a 10% discount on the 3 that form part of a set, but the fourth book still costs $8.
Your mission is to write code to calculate the price of any conceivable shopping basket (containing only books of the same series), giving as big a discount as possible.
For example, how much does this basket of books cost?
One way of grouping these 8 books is:
This would give a total of:
Resulting in:
Which equals $51.60.
However, a different way to group these 8 books is:
This would give a total of:
Resulting in:
Which equals $51.20.
And $51.20 is the price with the biggest discount.
Define a single Go func, Cost, which calculates the cost for a given list of books based on the defined discounts.
Use the following signature for func Cost:
func Cost(books []int) int
Cost will return the total cost (after discounts) in cents. For example, for a single book, the cost is 800 cents, which equals $8.00. Only integer calculations are necessary for this exercise.
Edit via GitHub
Sign up to Exercism to learn and master Go with 34 concepts, 141 exercises, and real human mentoring, all for free.