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Solution: Find First and Last Position of Element in Sorted Array

Explore how to use a modified binary search to find the first and last positions of a target value in a sorted array. Understand how to perform two targeted binary searches to achieve an efficient O(log n) solution, handling edge cases and ensuring accurate boundary detection in a sorted array.

Statement

You are given an integer array, nums, that is sorted in non-decreasing order. Your task is to find the first and last indexes of a given value, target, within this array.

If the target does not appear in the array at all, return [-1, -1].

Note: You must write an algorithm with O(logn)O(\log n) ...