Extra Long Factorial

 Question :-

https://www.hackerrank.com/challenges/extra-long-factorials/problem

Solution in C++ language :-

#include<iostream>

using namespace std;

int main(){

    int n;

    cin>>n;

    int arr[100000]={0};

    int leng=1,x=0,num=0,i;

    arr[0]=1;

    for(i=2;i<=n;i++){

        x=0;

        num=0;

        while(x<leng){

            arr[x]=arr[x]*i;

            arr[x]=arr[x]+num;

            num=arr[x]/10;

            arr[x]=arr[x]%10;

            x++;

        }

        while(num!=0){

            arr[leng]=num%10;

            num=num/10;

            leng++;

        }

    }

    for(i=leng-1;i>=0;i--){

        cout<<arr[i];

    }

    return 0;

}