540. Single Element in a Sorted Array
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Given a sorted array consisting of only integers where every element appears twice except for one element which appears 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.
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public class Solution { public int singleNonDuplicate(int[] nums) { int start = 0;int end = nums.length - 1;int mid = start + (end - start) / 2;while (start < end) {mid = start + (end - start) / 2;if (nums[mid] == nums[mid + 1]) {if ((mid & 1) == 0)start = mid + 2;elseend = mid - 1;} else if (nums[mid] == nums[mid - 1]) {if ((mid & 1) != 0)start = mid + 1;elseend = mid - 2;} elsereturn nums[mid];}return nums[end]; }} 0 0
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