Help me in solving GSCV209 problem

My issue

My code

// Solution as follows

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

int main() 
 int t;
 //accept the count of test cases given in the the 1st line
 //Run a loop to accept 't' inputs
   int N;
 //accept an integer N in each test case
 //output the number mirror for each test case
 return 0;

Learning course: C++ for problem solving - 1
Problem Link: CodeChef: Practical coding for everyone

i dont know c++ ;
i know c and python

can you please explain using C