Tuesday, 27 October 2015

Extra Long Factorials

Extra Long Factorials

You are given an integer N. Print the factorial of this number.
N!=N×(N1)×(N2)××3×2×1

Input
Input consists of a single integer N, where 1N100
Output
Print the factorial of N.
Example
For an input of 25, you would print 15511210043330985984000000.
Note: Factorials of N>20 can't be stored even in a 64bit long long variable. Big integers must be used for such calculations. Languages like Java, Python, Ruby etc. can handle big integers but we need to write additional code in C/C++ to handle huge values.
We recommend solving this challenge using BigIntegers.

or by using python----

from math import factorial  
n=int(raw_input())   
print factorial(n)

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