func_code_string: #include <bits/stdc++.h>   using namespace std;   void solve();   void YN(bool b) {     if (b) {       cout <<  YES             <<   n ;       ;     } else {       cout <<  NO             <<   n ;       ;     }   };   void yn(bool b) {     if (b) {       cout <<  Yes             <<   n ;       ;     } else {       cout <<  No             <<   n ;       ;     }   };   void queries() {     int n;     cin >> n;     while (n--) solve();   }   const int maxn = 200200;   void solve() {     int n;     cin >> n;     vector<int> a(n);     vector<int> b;     map<int, int> m;     for (int i = 0; i < n; i++) {       cin >> a[i];       m[a[i]]++;     }     for (auto i : m) {       b.push_back(i.second);     }     map<int, bool> taken;     long long sum = 0;     sort(b.begin(), b.end());     for (int i = b.size() - 1; i >= 0; i--) {       if (!taken[b[i]]) {         sum += b[i];         taken[b[i]] = 1;       } else {         for (int j = b[i]; j > 0; j--) {           if (!taken[j]) {             sum += j;             taken[j] = 1;             break;           }         }       }     }     cout << sum <<   n ;     ;     return;   }   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     queries();     ;     return 0;   }   