Please solve the programming task below using a self-contained code snippet in a markdown code block.

You are given a 0-indexed integer array nums of length n.
The sum score of nums at an index i where 0 <= i < n is the maximum of:

The sum of the first i + 1 elements of nums.
The sum of the last n - i elements of nums.

Return the maximum sum score of nums at any index.
 
Please complete the following python code precisely:
```python
class Solution:
    def maximumSumScore(self, nums: List[int]) -> int:
```