#include <iostream>
#include<bits/stdc++.h>
using namespace std;
int main() {
// your code goes here
int t;
cin>>t;
while(t-->0)
{
int n;
cin>>n;
int a[n];
for(int i=0;i<n;i++)
cin>>a[i];
sort(a,a+n);
int b[n];
for(int i=0;i<n;i++)
b[i]=a[n-i-1];
int ans=0;
int i=0;
while(i<n)
{
int j=i+b[i];
if(j<=n) ans++;
i=j;
}
cout<<ans<<endl;
}
return 0;
}
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