136. Single Number Given a non-empty array of integers nums, every element appears twice except for one. Find that single one.You must implement a solution with a linear runtime complexity and use only constant extra space. Example 1:Input: nums = [2,2,1]Output: 1Example 2:Input: nums = [4,1,2,1,2]Output: 4Example 3:Input: nums = [1]Output: 1 Constraints:1 -3 * 104 Each element in the array appe..
