class Solution
{
public:
    vector<int> singleNumber(vector<int> nums) 
    {
        // Code here.
        
        map<int,int>mp;
        for(int i=0;i<nums.size();i++)
        {
            mp[nums[i]]++;
        }
        vector<int>v;
        map<int,int>::iterator it;
        for(auto it:mp)
        {
            if(it.second==1) v.push_back(it.first);
        }
        return v;
    }
};