[알고리즘] 40. Extra Long Factorials

The factorial of the integer , written , is defined as:

Calculate and print the factorial of a given integer.

For example, if , we calculate  and get .

Function Description

Complete the extraLongFactorials function in the editor below. It should print the result and return.

extraLongFactorials has the following parameter(s):

• n: an integer

Note: Factorials of  can't be stored even in a  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.

Input Format

Input consists of a single integer 

Constraints

Output Format

Print the factorial of .

Sample Input

Sample Output

Explanation

답 : 

#!/bin/python3

import math

import os

import random

import re

import sys

# Complete the extraLongFactorials function below.

if __name__ == '__main__':

n = int(input())

res = 1

for i in range(1,n+1):

res *= i

print(res)

간단하게 Factorial 계산을 할 수 있다.