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class Solution {
public:
    long long minimumPossibleSum(int n, int target) 
    {
        long long sum=0;
        unordered_map<int,int>m;
        int cnt=0;
        int i=1;
        while(cnt<n)
        {
 
            if(m.find(i) == m.end())
            {
                sum+=i;
                cnt++;
            }
            m[target-i]++;
            i++;
        }
        return sum;
    }
};

prog.cpp: In member function ‘long long int Solution::minimumPossibleSum(int, int)’:
prog.cpp:6:9: error: ‘unordered_map’ was not declared in this scope
         unordered_map<int,int>m;
         ^~~~~~~~~~~~~
prog.cpp:6:23: error: expected primary-expression before ‘int’
         unordered_map<int,int>m;
                       ^~~
prog.cpp:12:16: error: ‘m’ was not declared in this scope
             if(m.find(i) == m.end())
                ^
prog.cpp:17:13: error: ‘m’ was not declared in this scope
             m[target-i]++;
             ^

Standard output is empty