Search `target` in sorted ascending `nums`. Return index or `-1`. Variant **#42**.
Example 1
Input: nums = [42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80], target = 54
Output: 6
Constraints
Acceptance: 70% · Topics: binary-search, array