Я написал программу

#include
using namespace std;
int n;
int main(int argc, char *argv[])
{
  std::cout < "Before reading from cin" < std::endl;

   // Below reading from cin should be executed within stipulated time
   bool b=std::cin >> n;
   if (b)
      std::cout < "input is integer for n and it's correct" < std::endl;
   else
      std::cout < "Either n is not integer or no input for n" < std::endl;
  return 0;
}