C. Two Teams Composing

#include <bits/stdc++.h>

using namespace std;

int main() {
#ifdef _DEBUG
  freopen("input.txt", "r", stdin);
//  freopen("output.txt", "w", stdout);
#endif

  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    vector<int> cnt(n + 1);
    for (int i = 0; i < n; ++i) {
      int x;
      cin >> x;
      ++cnt[x];
    }
    int mx = *max_element(cnt.begin(), cnt.end());
    int diff = n + 1 - count(cnt.begin(), cnt.end(), 0);
    cout << mx << " " << diff << endl;
    cout << max(min(mx - 1, diff), min(mx, diff - 1)) << endl;
  }

  return 0;
}

​​https://codeforces.com/problemset/problem/1335/C​​ 从数量的角度想。