Problem In my Code

help
1

Problem Code - FCTRL2
here is my code

#include
#include<math.h>
using namespace std;
#define ll long long

int main()
{
int t;
cin >> t;
for(int j=0;j<t;j++)
{

      int i,f=1,n;
      
      
      cin >> n;
      for(i=1;i<=n;i++)
      {
           f=f*i;
           
      }
      cout << f << endl;
 }

}

can anyone tell what’s the problem with my code

2

first line of code is just #include you are suppose to add some header to it.