0260_Single_Number_III.cpp

#pragma GCC optimize("Ofast","inline","ffast-math","unroll-loops","no-stack-protector")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native","f16c")
auto init = []()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    return 'c';
}();
class Solution {
public:
    vector<int> singleNumber(vector<int>& nums) {
        unordered_map<int,int> mp;
        for(int i: nums){
            mp[i]++;
        }
        vector<int> res;
        for(auto i: mp){
            if(i.second==1){
                res.emplace_back(i.first);
            }
        }
        return res;
    }
};