single-element-in-a-sorted-array

Single Element in a Sorted Array

LeetCode #: 540

Difficulty: Medium

Topics: -

Problem

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.

Example 1:

Input: [1,1,2,3,3,4,4,8,8]
Output: 2

Example 2:

Input: [3,3,7,7,10,11,11]
Output: 10

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

Complexity Analysis

Time complexity: O(log n)

Space complexity: O(1)