First & Last Occurrences

Approach Explanation (ﾉ◕ヮ◕)ﾉ*:･ﾟ✧

1. I wrote two helper functions, one to find the first_occurrence and one to find the last_occurrence using binary search.
2. Each function returns an index (or -1 if not found).
3. In the final return, I must call these functions with () so they execute and give results.
4. Without (), Python just returns the function reference, not its output.

Method Used: (〜￣▽￣)〜

• Binary search twice
• Function calls
• Efficient runtime