2025-08-15 11:21:42 +0000 UTC

Sum of Unique Elements
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Code

class Solution:
    def sumOfUnique(self, nums: List[int]) -> int:
        enc = [0] * 101
        res = 0
        for num in nums:
            count = enc[num]
            if count == 1:
                res -= num
                enc[num] = 2
            elif count == 0:
                res += num
                enc[num] = 1
        return res