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class Solution {
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 public:
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  int sumOfUnique(vector<int> &nums) {
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    int sum = 0;
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    map<int, int> mp;
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    for (auto x : nums) mp[x]++;
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    for (auto m : mp) {
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      if (m.second == 1) sum += m.first;
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    }
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    return sum;
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  }
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};