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Single Number

Single Number Given a non-empty array of integers nums, every element appears twice except for one. Find that single one. Example 1: Input: nums = [2,2,1] Output: 1 Example 2: Input: nums = [4,1,2,1,2] Output: 4 Example 3: Input: nums = [1] Output: 1 Using a HashSet (linear space complexity) We can …

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