#include "iostream"
#include <map>

using namespace std;

void solve() {
  int n, x;
  cin >> n;
  map<int, int> hash_map;

  for (int i = 0; i < n; i++) {
    cin >> x;
    if (hash_map.count(x) == 0)
      hash_map[x] = 1;
    else
      hash_map[x]++;
  }

  for (int k = 0; k <= n; k++) {
    int cur_mex = 0;
    for (auto &i : hash_map) {
    }
  }
}

int main() {
  int t;
  cin >> t;
  while (t--)
    solve();
}