Generate test + compare code C++ (Use for offline)

//Make CSP great again
#include <bits/stdc++.h>
#define TASK "TESTCODE"
using namespace std;
const string NAME = "TESTCODE";
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
long long Rand(long long l, long long r)
{
    return l + rd() * 1LL * rd() % (r - l + 1);
}
void Gentest()
{
   cout << Rand(1, 1e12);
}
void OutputTest()
{

}
int main()
{
   //ios_base::sync_with_stdio(false);
   //cin.tie(nullptr);
   int t; cin >> t;
   for (int i = 1; i <= t; ++ i)
   {
       ofstream inp((NAME + ".INP").c_str());
       Gentest();
       inp.close();
       system((NAME + ".exe").c_str());
       system((NAME + "_trau").c_str());
       if (system(("fc " + NAME + ".OUT " + NAME + ".ANS").c_str()) != 0)
       {
           cout << "TEST " << i << ": WRONG";
           OutputTest();
           return 0;
       }
       cout << "TEST " << i << ": CORRECT" << '\n';
   }
}