leetcode:唯一元素的和

src:

class Solution:
    def sumOfUnique(self, nums: List[int]) -> int:
        ans = 0
        mp = defaultdict(int)
        for num in nums:
            mp[num] += 1
        
        for num in mp:
            if mp[num] == 1:
                ans += num
        
        return ans

快乐初六