Find First and Last Position in Sorted Array

Question

## Problem

Find the first and last index of a target in a sorted array; the interviewer specifically wants a binary-search solution.

## Example
```
[5,7,7,8,8,10], target=8 -> [3,4]
```

## Constraints
- 0 ≤ n ≤ 10^5

## Approach
Two binary searches (lower/upper bound). Reported Splunk question.