Help me in solving AVGFLEX problem

help
,
1

My issue

i am facing tle

My code

#include <bits/stdc++.h>
using namespace std;

int main() {
    int t;
    cin>>t;
    while(t--)
    {
        int n;
        cin>>n;
        int a[n];
        int flag=0;
        int count=0;
        
        for(int i=0;i<n;i++)
        {
            cin>>a[i];
        }
        sort(a,a+n);
        for(int i=0;i<n;i++)
        {
            if(a[i]<a[i+1]){}
            else
            if(count<=i+1){flag++;}
            count=0;
        }
        cout<<flag<<endl;
    }}

Problem Link: AVGFLEX Problem - CodeChef