0540. Single Element in a Sorted Array

https://leetcode.com/problems/single-element-in-a-sorted-array

Description

You are given a sorted array consisting of only integers where every element appears exactly twice, except for one element which appears exactly once. Find this single element that appears only once.

Follow up: Your solution should run in O(log n) time and O(1) space.

Example 1:

**Input:** nums = [1,1,2,3,3,4,4,8,8]
**Output:** 2

Example 2:

**Input:** nums = [3,3,7,7,10,11,11]
**Output:** 10

Constraints:

• 1 <= nums.length <= 10^5

• 0 <= nums[i] <= 10^5

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