2025-08-22 17:29:48 +0000 UTC

Find the XOR of Numbers Which Appear Twice
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Code

class Solution:
    def duplicateNumbersXOR(self, nums: List[int]) -> int:
        freqs = [0] * 51
        res = 0
        for i in range(len(nums)):
            freqs[nums[i]] += 1
            if freqs[nums[i]] == 2:
                res ^= nums[i]
        return res