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

You have n boxes. You are given a binary string boxes of length n, where boxes[i] is '0' if the ith box is empty, and '1' if it contains one ball.
In one operation, you can move one ball from a box to an adjacent box. Box i is adjacent to box j if abs(i - j) == 1. Note that after doing so, there may be more than one ball in some boxes.
Return an array answer of size n, where answer[i] is the minimum number of operations needed to move all the balls to the ith box.
Each answer[i] is calculated considering the initial state of the boxes.
 
Please complete the following python code precisely:
```python
class Solution:
    def minOperations(self, boxes: str) -> List[int]:
```