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

You are given a string s consisting only of the characters '0' and '1'. In one operation, you can change any '0' to '1' or vice versa.
The string is called alternating if no two adjacent characters are equal. For example, the string "010" is alternating, while the string "0100" is not.
Return the minimum number of operations needed to make s alternating.
 
Please complete the following python code precisely:
```python
class Solution:
    def minOperations(self, s: str) -> int:
```