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

Given a sorted array of distinct integers and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in order.
You must write an algorithm with O(log n) runtime complexity.
 
Please complete the following python code precisely:
```python
class Solution:
    def searchInsert(self, nums: List[int], target: int) -> int:
```