Please point out my mistake

help
1

My solution link is CodeChef: Practical coding for everyone

There is no compilation error but i get wrong answer on submitting.

Thanks in advance

2

overflow, use arrays.

3

Hey
See if we take factorial of 100 then its decimal digit will be much greater so either use array overflow
or
use
#include <boost/multiprecision/cpp_int.hpp>
using namespace boost::multiprecsion;
and where u have declared factorial =1 ;
use cpp_int factorial=1;

4

STACK OVERFLOW