func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long t, n, a, b, i, same, unique, ans;     cin >> t;     while (t--) {       cin >> n;       same = 0;       unique = 0;       unordered_map<long long, long long> m;       for (i = 0; i < n; i++) {         cin >> a;         m[a]++;         if (m[a] == 1) {           unique++;         }         same = max(same, m[a]);       }       if (same < unique + 1) unique--;       ans = min(same, unique);       cout << ans << endl;     }     return 0;   }   