Not able to solve this problem

#1

i tried long long int nut it is shpwing 0 please help to solve this.

#2

@kushal1998 in the variable of type long long int we can store a number of 18 digits maximum, where as 100! has around 158 digits. That is the reason it is giving 0 in the output.
The correct way to solve this question is to make an array of around 200 size and store every digit individually in it.
Hope this helps.