Python/project_euler/problem_020/sol3.py
Dhruv 44254cf112
Rename Project Euler directories and other dependent changes ()
* Rename all Project Euler directories:

Reason:
The change was done to maintain consistency throughout the directory
and to keep all directories in sorted order.

Due to the above change, some config files had to be modified:
'problem_22` -> `problem_022`

* Update scripts to pad zeroes in PE directories
2020-10-15 12:43:28 +05:30

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"""
Problem 20: https://projecteuler.net/problem=20
n! means n × (n 1) × ... × 3 × 2 × 1
For example, 10! = 10 × 9 × ... × 3 × 2 × 1 = 3628800,
and the sum of the digits in the number 10! is 3 + 6 + 2 + 8 + 8 + 0 + 0 = 27.
Find the sum of the digits in the number 100!
"""
from math import factorial
def solution(num: int = 100) -> int:
"""Returns the sum of the digits in the factorial of num
>>> solution(1000)
10539
>>> solution(200)
1404
>>> solution(100)
648
>>> solution(50)
216
>>> solution(10)
27
>>> solution(5)
3
>>> solution(3)
6
>>> solution(2)
2
>>> solution(1)
1
>>> solution(0)
1
"""
return sum(map(int, str(factorial(num))))
if __name__ == "__main__":
print(solution(int(input("Enter the Number: ").strip())))