솜씨좋은장씨

Given a non-empty array of integers, every element appears twice except for one. Find that single one. Note: Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory? Example 1: Input: [2,2,1] Output: 1 Example 2: Input: [4,1,2,1,2] Output: 4 Solution from collections import Counter class Solution: def singleNumber(self, nums: List[int]) -> int: c..