func_code_string: #include <bits/stdc++.h>   using namespace std;   int buff1, buff2;   void solution(vector<int> v) {     map<int, int> counter;     for (int n : v) counter[n]++;     vector<int> counts;     for (auto it : counter) {       counts.push_back(it.second);     }     sort(counts.begin(), counts.end(), greater<int>());     int cur = INT_MAX, ret = 0;     for (int n : counts) {       if (cur <= 1) {         break;       }       cur = min(cur - 1, n);       ret += cur;     }     cout << ret << endl;   }   int main() {     int nTest;     cin >> nTest;     for (int i = 0; i < nTest; i++) {       int N;       cin >> N;       vector<int> v;       for (int i = 0; i < N; i++) {         cin >> buff1;         v.push_back(buff1);       }       solution(v);     }     return 0;   }   