Search `target` in sorted ascending `nums`. Return index or `-1`. Variant **#13**.
Example 1
Input: nums = [13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51,53], target = 49
Output: 18
Constraints
Acceptance: 75% · Topics: binary-search, array