Compute maximum score using up to 3 categories

## Problem A library runs a summer reading program. Each book a student reads earns a certain number of points, and each book belongs to a **category**. A student may score points from **at most 3 books**, with the restriction that the selected books must be from **distinct categories** (i.e., no two selected books can share the same category). Given a list of books the student read, compute the **maximum total score** the student can achieve. ### Input - `books`: a list of tuples `(category: str, points: int)` - The list may be empty. - Assume `points` are integers (typically non-negative). ### Output - Return an integer: the maximum achievable total points. ### Function signature (Python) ```python def get_max_score(books: list[tuple[str, int]]) -> int: ... ``` ### Examples / Tests ```python test1 = [ ("Adventure", 5), ("Adventure", 2), ("History", 3), ] assert get_max_score(test1) == 8 # 5 (Adventure) + 3 (History) test2 = [ ("Adventure", 4), ("History", 3), ("Reference", 1), ("Fiction", 2), ] assert get_max_score(test2) == 9 # 4 + 3 + 2 test3 = [ ("Biography", 2), ("Biography", 4), ("Science", 3), ("Science", 1), ] assert get_max_score(test3) == 7 # 4 + 3 test4 = [] assert get_max_score(test4) == 0 ``` ### Clarifications - You may pick 0, 1, 2, or 3 books (whichever maximizes the score). - You cannot pick more than one book from the same category.