Broken Calculator

#1

I am unable to find a mistake in my code…6 out of 7 test cases have been rejected. Please check my code. My code link is 159158.

#2

@Kajal
Your code only works for small inputs till n<=20. Factorials grow extremely fast and go out of range of long long int even rather quickly.
If you try running your code for even input like n=21 or n=22 , you will see that it shows a wrong answer. Compare it with calculating the answer in your calculator.
This is actually less of a problem to calculate factorial as that part is extremely easy and more of a problem to find a way to store it . Even long long int datatype can only store a number atmost 18 digits long.
There is no data type in C++ to store such large numbers so you will need to figure out a way around this to store such large numbers and do the computations on it.
In this problem we can get an input as large as n=500 ( as specified in problem constraints ). 500! is over 1100 digits long.
Think of way to store such large values and try again.

#3

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