public void Five_Books_Should_Leave_One()
{
var bookSet = new BookSet(1, 2, 3, 4, 5);
var result = bookSet.PopCart(4);
result = bookSet.PopCart(5);
Assert.That(result.Length, Is.EqualTo(1));
}
public decimal CostWith(int book)
{
var set = new BookSet();
foreach (var b in _books)
{
set.Add(b);
}
set.Add(book);
return set.Cost();
}
private decimal GetMinPriceForSet(BookSet originalBookSet, decimal minPrice)
{
if (originalBookSet.IsEmpty())
return 0m;
for (int includeAtMost = 2; includeAtMost <= 5; includeAtMost++)
{
var bookSet = originalBookSet.Clone();
var cart = bookSet.PopCart(includeAtMost);
minPrice = Math.Min(minPrice,
GetPrice(cart, 8m) + GetMinPriceForSet(bookSet, minPrice));
}
return minPrice;
}
