#include <bits/stdc++.h>   using namespace std;   int run(int n) {     int i, a[n];     for (i = 0; i < n; i++) cin >> a[i];     sort(a, a + i);     int ans = 0;     int tempCount = 0;     for (i = 0; i < n; i++) {       tempCount++;       if (a[i] == tempCount) {         ans++;         tempCount = 0;       }     }     return ans;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int t;     cin >> t;     int n;     while (t--) {       cin >> n;       cout << run(n) <<   n ;     }     return 0;   }   