. - 力扣(LeetCode) from typing import List # 排序后做,题意说最多出现2次。前后做比对,相同则做异或操作即可 class Solution: def duplicateNumbersXOR(self, nums: List[int]) -> int: result = 0 nums.sort() for i in range(len(nums) - 1): if nums[i] == nums[i + 1]: result ^= nums[i] return result